Tank accessory kit no 1

Here's the first unofficial accessory pack for m_bergman's excellent WWII "Tanks and Vehicles" collection.

In this accessory pack I've added or modified the following for several vehicles (German at this point, Americans likely next)

NOTE: Though the models are still at the original 1:200 scale, I'm printing mine at 1:100; I can't promise the fine details will come through on smaller scales.

1. Separate tracks that can be printed with little or no support; makes cleanup much easier and prevents some of the distortions that occur when trying to print the entire vehicle. Also allows smooth bottoms on the vehicles with support only needed for overhanging tread guards and the like.

2. Detailed treads and wheels that can add more realism when printing at larger scales.

3. Addition of Pioneer bridges to allow conversion of Sd Kfz 251/1 to 251/7 Pioneer transport.

4. Additon of my own version of the Opel Maultier (adapted from Bergman's Opel Blitz) with sc