I think your going about it the wrong way to be honest, I am not sure if you have heard of, or seen Mark Evans' "A 4x4 is born". He builds a hybrid from scratch, to the untrained eye it is a 90, however this 15 part series would give you an extremply good idea of what to do.
Persoanly, I would probaly buy some old 90's (or whatever you want to build) and start from there, strip them down, this way you have all or most of the parts, get one, for example with a good chassis, then get it sorted out and galvanised, you can use the axles and diffs, transmission can be overhauled, the list goes on buy you will get the picture.
In the end you have built it using new or as new parts mostly, but lets face it, do you need to buy EVERYTHING from new? I am sure you could utilise many components from an old landy.
You could also strip one down, sell bits you can't use on ebay, thus making money for your new parts, and start with a rolling chassis, this immedialy saves you a lot of money.
Also remember if you build it from scratch it is a new vehicle, so will need to be checked etc by the relevant authorities.
You could also go with Grunts idea, strip it right down, galv and underseal, clean up every component, respray them make them look brand new. So while your doing all these jobs, you will be passing time, getting the money in to pay for things you need to buy etc...
Goodluck.
