German 15cm sIG and the various units using it

[BigDuke66]

I'm talking about the weapon 078 in the German OOB.

1. It seems that the range is wrong, I found only 4700meters not 6400meters in every source I stumbled over.

2. The first SP version the "sIG I B"(ID 065 & ID 865) were also called "Sturmpanzer I Bison" maybe a thing to add, besides that it only carried 3 rounds of ammo in the vehicle as no more could be stored but more ammo was transported in a halftrack(Sd.Kfz. 10) by another 2 crew members. The crew on the sIG IB itself was 3 men large.

3. The "sIG33 PzII"(ID 979) was also called "Sturmpanzer II Bison".

4. The naming for the Grille and its variants irritates a bit, while the first version is called "sIG38(t) Grille"(ID 066), the 2nd version is called "sIG38/1 (t)"(ID 976) and the 3rd version "sIG38/2 (t)"(ID 968).
There are several names for them all, but I just what to point out that the gun is the sIG 33/1(1st version) or 33/2(2nd & 3rd version), the chassis is either the H(1st version) version or the K(2nd version) of the Panzerkampfwagen 38(t) or the Jagdpanzer 38(t)(3rd version but one source indicates in was the Bergepanzer 38 version) and the Sonderkraftfahrzeug numbers used are 138/1 for 1st & 2nd version and 138/2 for 3rd version.

The gun itself didn't change despite a name change to sIG33/1 and sIG33/2 but these had just modifications to the carriage to mount it on the appropriate chassis.

As there is no other 15cm sIG version used in the game I suggest to clear this a bit by using:
"sIG33 Grille H" for ID 066.
"sIG33 Grille K" for ID 976. Some use M here because the chassis version used was based on the PzKw 38 K but was designated as Geschützwagen M so M could also be used.
"sIG33 Hetzer" for ID 968.
Simply to point out that this is still the sIG33 but on different chassis so the player can expect the same weapon performance but a different unit performance.

5. Entry date for the second Grille version(ID 976) should be changed, production did start in November 43 with first vehicles ready in December 43, May 43 seem way too early.

6. The armor of the "SturmIG 33"(ID 978) seems a bit off, in a Panzer Tracts volume I found a diagram that shows the armor values, I have a pic attached if that is OK.

PS
Sturmpanzer IV comes later as that one really used a different version of the 15cm, instead of L/11,4 it was L/12 so maybe the performance was different despite using the same ammo as the L/11,4 version.