There is of course an alternative to having to shell out for a T5 box and associated gubings the mt75 box is known to be a very strong box and as you will probably know the lesser spec cheapo 2.0 twincam has such a box so its possible for a mechanicly minded person to convert the 4x4 box to rear wheel drive.
Plus you have the added bonus of being able to sell the transfer box to someone with either an 2.9 4x4, 2.0 sapphire 4x4, cosworth 4x4 or even an escort cosworth.
of course u will have to get a 2x sump but the 4x4 sump and diff should fetch around £150-175