Ah, all fair points I would've thought smaller engineering firms would be more inclined to provide pre-production working samples.It's all about the numbers.
No company I could find takes on a design and build for 20-30 units at a price which is reasonable. Most stipulate orders in the hundreds and I have no desire to spend that sort of wonga on a little pet project.
It's actually cheaper to have the pcb and loom made, then adapt the connectors they have to work with the R35. The connectors I have sourced are as close to the OEM ones as I can find. The actual OEM connectors are an "OEM restricted item" and I cannot get hold of any at all. If I could it would simplify the manufacturing side completely and save me a whole lot of time.
From a cost perspective I could have had the PCB and loom made in China for about £10 less (landed) but after testing 2 different suppliers, they were cheaply made, and one actually failed after about 2 weeks. Given this isnt my day job I have no wish to be faced with returned units over the next 12 months so I went with a European supplier whose supplied module was well constructed and has a real OEM feel to it.
I'm definitely interested but just need to find out more about installation as I'm not overly confident with my DIY skills