Quick update, not much to show because work has been busy lately.
It feels like all I have been doing is cleaning up the roll cage, but anyway, I have got it built, looks quite good and fits at least. I can see why the masters on here end up building their own cage, think it would have been easier and more accurate. I had to add small pins to try and make it stronger and easier to build too, otherwise I would have broken it a lot from handling.
Thanks for looking, hope to start working on the engine next and see if I can get it to fit.