Nice job on an interesting (odd) subject! I have this kit and itch to jump onto it - there is a fair amount of info now available which allows one to do the mostly minor tweaks needed to obtain more external accuracy. The interior details are more sketchy and vague - but it's the interior which I want to tackle... hence my not yet doing the kit! Decisions decisions, and procrastination!
Your's came out quite nice - the track-reversal is trivial and, I think, actually happened from time to time. So... no sweat!
About versions with swapped-on turrets... there are a few pics around which show one late in the war - I think in the Balkans - which has a Pz I turret, and another which might have some other small and pretty light-weight turret.
I would bet that these turrets were mounted into that big round hatch - which probably served as the first limiting factor for how wide a turret might be used. It's easier to build a frame to mount a turret within a larger extant opening than it is to enlarge that hole...
I would guess that you could be pretty safe modeling such by making a cover plate with the smaller hole of choice for the turret you choose and "welding" it onto the top. Probably remove the hatch coaming - and go from there. You can bet that this modification was a local shop effort and kept pretty simple.
In about every other way, the externals of the vehicles with turrets look the same as the stock version. Internally, they may have scrapped the extra commo equipment in place of a few boxes of ammo...
Bob
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