There is a lot of contention about ol’ F13, including here on this site and the old site.
A few things are known. All of the Fehrmann Tigers were hybrids, and came from a panzer training school. Some of the mismatched parts on this tank include zimmerit applied over the original Panzer Gray. The gun and cupola appear to be replacements, the paint does not match. The early road wheels were replaced with the later steel wheels. The smoke launcher mounts were cut off with a torch.
Most everything else about the tank is subject to debate, including its color and markings.
All of the known photos of the tank were taken post war, so the condition of the tank when it was in service/destroyed is unknown. Things like tools, stowage boxes, side skirts, etc. may have been removed after it was knocked out. Or maybe not. This does give you quite a bit of freedom to built it as you want.
Ken