I can't offer any practical advice, only boundless enthusiasm and support - and faith you'll nail it!
Cheers Zac, I'm loving the enthusiasm and support, I'll get there in the end, it might take weeks of trial and error but it will be done!

I unexpectedly had a whole day pretty much free today so got quite a bit done on the engine. I added a few details, I'm not sure what the little handle on the starboard side at the front of the sump (?) is, I'm assuming it is a dipstick. The engine was spayed with Tamiya flat aluminium lacquer and weathered a touch with oils.
20230425_110016 by
Richard Williams, on Flickr
Trial runs of fitting the cylinders were nightmarishly awkward in attempts 1 and 2. It should be straightforward because the RAF 1a has a 90 degree V angle and I used evergreen angle to build up the top of the crank case. It was still awkward, mostly because the base of all the cylinders were plastered with ca glue from the 2 failed attempts. I got there in the end though.
20230425_211552 by
Richard Williams, on Flickr
I think the copper coloured U shape is a breather tube, perhaps somebody can let me know. Adding this caused much head scratching, I just used garden wire in the end. The firewall was glued to the engine, holes drilled and the wire glued in place. I had drilled holes in the cylinders to accept the pipes. My method was not the neatest but all of this will be in shadow so it will do.
Here is the nearly completed engine sitting in place. There should be more rods and valves but adding them would be a bridge too far for me, especially as they won't be seen.
20230425_220417 by
Richard Williams, on Flickr
The really awkward business of the engine covers comes next but that will have wait until the weekend when I will hopefully have a eureka moment.
Thanks so much for reading and leaving such generous comments.
Richie