I also recently made the Sloppy J Austin armoured car... (currently revving up in round 10 of the LPL!

)
Truthfully - considering it cost a handsome £15.00 GBP - I didn't think it was a very good model.
The basic resin lump wasn't well cast. It had a number of air bubble defects and 'furry' bits. The underside had been sanded - unevenly. The quality of the detail (rivets etc) was noticeably variable on different parts of the body. The metal parts took a lot of de-flashing, and then there were no obvious points at which to attach them to the resin body... You just have to take a guess and stick the bits on by eye, because the instructions are sketchy, to put it kindly...

So all in all, whilst the end product looks pretty good, I can't pretend I was impressed by the kit in its raw state.