Thanks for the reply guys
Yes it did look like a fairly expensive pursuit but i thought it would perhaps be the easiest option. I'd estimated the cost of the next phase of upgrades being the transfer case/mount and tyres at about the 3K mark. Would happily spend less if possible. I can certainly attest to the quality of Tanashi's parts (apologies Tanashi, I'll get a pic of the tank skid plate now that its fitted up).
Perhaps the best course of action is to try and source a donor case domestically and then just import the gears and rebuilt it myself (with a strengthen transfer cradle/mount from Tanashi).