Been working on the rear drive train. Will be using a pair of Mx5 rear uprights but with modified Ford Sierra xr4x4 stub axles and uprights. Had to machine a tiny bit off the Sierra hub but nothing major and was remarkably close to the Mx5 dimensions anyway.
The reason for wanting to use the Sierra stub axle was to be axle to have a replaceable CV joint plus removing the shaft without damaging the CV joint on an Mx5 stub axle is a PITA. Also there are uprated parts available or the Sierra CV's and I am planing on throwing well over 300 HP at it.