Hello Locarnus and Cw58!
Thanks for helping in the discussion of this unit classes/traits discussion...
Cw58: Thanks for your timely intervention!! I had forgotten about the ideas exchange we had two years ago (but now I copied the that texts in a separate document stored in my modding "knowledge database"

). I was going to suggest trying to use the Strat Bomber unit class for the Sturmtiger unit to give it long term suppression without defensive fire support capabilty, but, of course we can use the Armored train class for that purpose! Thanks again to you for making all those very detailed tests at that time!
So, guys, this is what I was thinking about what can be done to implement the Sturmtiger in Locarnus "BE mod's mod"...
Sturmtiger primary switch: a tank class unit, with range = 0, making it able to be upgraded from regular Tiger gun tank at a reduced cost. It would also have the "bunkerkiller" trait because it would attack them from close range, gaining accuracy to land the big rockets on target.
Sturmtiger secondary switch: an armored train class unit, with range = 2, having long term suprresion but no defensive fire support capability. It would have the "nopurchase" trait, for making it non.visible in the tank class purchase screen. Besides, no "bunkerkiller" trait, because when firing from longer ranges, it would suffer an accuracy loss, and can act as a suppressive, heavy bombardment weapon. Or, alternatively, in order to make it less an effective "long range tank killer", give it lower Hard Attack value compared to the direct fire mode switch, but keeping the "bunkerkiller" trait.
Locarnus: I completely agree with you with the discussed stat values you propose. Two hexes in-game range is correct for a weapon with 6 km range, also the ammo count is not small when compared to other similarly armed or similar role units (like Wurfrahmen40 and Sturmpanzer I, cited by you), so, yes, this unit has to have more ammo compared to those two examples, I think it should have an ammo value of 5 points at least.
In what would be "my mod" I would implement the Sturmtiger with a triple switch:
- Primary: In a separate "Siege Artillery" class, for the sake of having it in a separate purchase screen grouped with other heavy artillery systems. It would behave just as a large assault gun: Range = 0, "bunkerkiller" trait, nolong term suppresion and no defensive fire ability.
- Secondary: Tank Class, this is to enable putting the Sturmtiger in the same upgrade series as the Tiger tank, to make possible upgrading it without paying full prestige cost. It would have the "nopurchase" trait, for making it non.visible in the tank class purchase screen. That idea was not considered by me back at the time, but it is a very good one. Credit and thanks to you, Locarnus, for it! It would have the same value stats as the siege artilery class unit.
- Tertiary: Armored Train class, with range = 2, and all the attributes described in the description for the secondary switch in the Locarnus Add-on mod. I would make it non-visible in the purchase screen by means of giving an "out of time range" availability date (for example 01.01.1930 to 02.01.1930), to avoid the "triple switch game freezing bug" problem.
Some related news:
- The "Jagd Sturmtiger" icon will be ready soon, I already made a "prototype" and it looks, to my eye, good enough!
The only problem with it is that because it has the long 8,8 cm gun barrel mounted up in the front of the vehicle, I had to cut down the barrel lenght to make it fit inside the maximum 148 pixel width allowed by the icon image file. It doesn't look very bad, fortunately.
I am thinking about giving this unit a switch to enable it a function of AT fire overwatch: making it an artillery class unit capable of providing defensive fire with range = 1, but with negative Hard Attack value and zero Soft attack value. Making it able to give support fire to friendly adjacent units just when they attacked by enemy tank (or any other "hard target" type) units. May be this is not to be used in a more "strategic scale" mod as Battlefield Europe is, but it would be a nice option for more "tactical" scaled mods/scenarios/maps.
- I will make the direct fire version of the regular Sturmtiger with zero elevation barrel, soon enough also.
Some non-related news

:
- Will complete my research about the variants of the Fw-190A fighter in order to try to give more different characteristics to the different sub-variants and make them more specialized/useful).
- Jager Infantry units: again in order to give them a more specialized role (not just another parachute infantry unit without air-drop ability), I was thinking about making them "forest (or jungle) specialists". I would give them a switch, coupled with a specific move type only for forested hexes, where they would have the camo trait (those guys would be trained as forest camouflage specialists), range=1, with just (somewhat reduced) soft attack values and no hard attack capabilty, reflecting te ability to make ambushes in forested terrains by means of always hitting first in one turn against an enemy with range = 0 (but said enemy would be able to attack them in the following turn, something like "forest snipers").
I have a complete set of icons for that type of units, I only have to make the "special" switch icon derivative.
Comments, ideas, etc... are always welcome!!
Greetings and best wishes!!