Spl's German Livery MOD zip has these all in xml (corrections to stock guns too), if they weren't already provided as stock XMLs.
An XML is the file itself the game uses to see the 'vehicle'. XML calls for a model. If there is an XML, that unit is available in game as a stand in or 'chimera' [monster of two parts] weirdo.
sIG 33 on Pz38H;
sIG 33 on PzI ('Bison' [buffalo] --with Tall super structure); and
Stu33IG PzIII with sIG 33 in solid looking super structure (root for the Brummbaars).
(The foruth SP IG is sIG 33 in a Pz II chassis: North Africa only.)
~Stock had no SP IG; well other than the purpose-built Brummbaars. We now have the premier SP IG --Grille, sIG on Pz38M.
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Marders ['PzJg' - ATG] still needed:
PzJg1 (PzI with um I forget... a little 47mm Czeck gun with a slider with the gun).
(Also R35 with that gun on it was used).
Marder IID (No stock XML --I supplied).
Marder III (odd: looks smaller than blueprints in some photos).
Marder III H (P38 with a PaK for a hat).
Marder IIIM (which is just like the Grille but with a PaK 40 in there).
~Stock has two modeled: The Lorraine Schlepper [Marder I] and the admittedly cool Marder II.
(Also wanted/needed: the Hotckiss and FCM (captured French) were ATG fitted and called Marder I schleppers like the Marder I Lorraine was. But West Front only I think.)
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Then we need to do Flakpanzer versions of those... (And some more AufPz [eg Pz38 with 222 'Hanglefette' turret].)
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Other people really could learn how to model.
You could read my Frgmotion tutorial here and start one.
If you have any problems ask me and I will literally walk you through it. (Hope I didn't just bite off more than I can chew there.) And then you'll know how to use model progs too.
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I am doing the PzII D right now. That will be the chassis of the Marder IID. (which someone can do).
Ryan Crierei did a PzI. It is either with EricR or needs to be converted from a 3dmax file type to Frgmotion .ugh and then out to '.x' file type. That will be the chassis for the PzJg I (and sIG33 I 'buffalo').
Mobius' Grille (Pz38M) becomes Marder III M by adding PaK40.