Hi @Maitland. First, good luck with this interesting project. Like @jhb171achill, I'll have one too, please!
@Past-Avenue is giving you good advice, straight from The Stables, if not the actual Horse's Mouth. His work to produce my two cattle wagons and the van was done as a single print and the results were quite excellent. (Still available from me, of course!).
Our good friend @Mayner has used a 3D printer in Hong Kong and I can attest to the total excellence of their printing.
But rather than face the Slings and Arrows of the taxman, why not persuade @Past-Avenue to do it?
What about it Enda? I think they'd sell.