Here's my conversion of the Minairons 1:100 (15mm) Panzer 1A into a PanzerJäger 1 47mm SPAT. The whole superstructure is a single 3d-printed unit; all I had to do was cut through the existing upper hull to create a cavity, a simple task as the Minairons plastic is quite soft.
There's no crew as yet. I have some Peter Pig German artillerymen on the way, which I hope will do the job.
The fighting compartment and gun conversion piece is available for sale at
http://shpws.me/OMkj.