I might be able to help with some parts - what exactly do you need? You probably know this, but the key to finding things is to have the part number - this sounds easy, but with the long R4 production run, not to mention the peculiarities of the Spanish-built cars and vans, it can be tricky.
If you pm me your email, I can send you a parts pdf.
Some photos of your engine and bulkhead plates would be very useful. What year is your van?
Good luck with your project!