Info on the Ausf A/B inside is pretty thin on the ground. The only images i have seen are a couple through the rear door and inside Guderian's /6 Command vehilce. Even the panzer Tracts books have no drawings on the interior, and that for me says it all.
ICM did a good job on their Ausf and from what little we know, they got it right. Zvezda went for the easy option and just put in an Ausf C interior. Eduard originally released a PE set that corrected the Zvezda kit, but then they pulled that and released once which simply enhanched it as it was. I was lucky in that i got hold of the original PE set. So short of scratchbulding based on very little info, or useing the resin set from MR Models designed for the ICM kit, i would just leave the inside as it is.
Painting the interior before fitting the upper hull s the was i have gone on all my 251's, its deffinetly the best option. I have not built mine yet but will dig out the instructions tonight and see if there is anything to be aware of. The engine is a nice touch, ICM has it in theirs as well.
Look forward to seeing your pics.
I am a Norfolk man and i glory in being so
On the bench: Airfix 1/72nd Harrier GR.3/Fujimi 1/72nd Ju 87D-3