Although Happy with the final result drawing wise, I still wanted to improve the print quality by make it as good as I can. I consulted a couple of very knowledgeable people whose principle advice was that I had the walls of the print too thick. The recommendation being around 2mm (it was 7mm at this point). I did manage to reduce it to 5mm without breaking anything that couldn’t quickly be fixed, but to get it to 2mm required another redraw. Thankfully I was able to reuse all the detail parts such as boiler bands and mud hole covers that I had drawn previously by using the derive function.

It’s now gone for print so fingers crossed this should be the final iteration.