Many thanks for the comments. Sorry for being quiet for a while. Have been busy when able. Lots of decision making on design and machine time, but seem to produce little visually.
The Tank Cartridges were set up for drilling and tapping. Had to obtain a metre of 10mm studding to make the fixings, as they're quite tall-
Luckily the igniter percussion inserts drilled out ok, then tapped both bases 1/8"BSP for the fittings.
The fuel taps were done as per previous post, so then just the Air Valve to design and make. Shown in next image on the left-
The left one shows the top of the reserve tank and the right shows the base of the main tank.
Next job was the fan shaft layout, bearing housings and 'Screw Down Grease Cups'. I had the latter vintage cups, but had to make the housings for them out of cast bronze bar.
Made a lot of work for myself milling to shape just to form the platforms to screw the cups into-
Finished them on the lathe so that I could fit a short piece of brass tube between them as a seal against water ingress-
Cheated a bit with these, as I'm hard soldering them to large flat brass washers to make the flange for bolting through and will match (in size, not colour) the ball bearing housings also machined from solid-
So here is the basic assembly/layout of the fan shaft and now about to start on the sprocket mount and fan/blades-
Regards