A little more progress. Secondary holders are built, focuser number 1 fitted, and first (day)light bagged!
Performed the first focus test out on the street to ascertain where to mount the secondary. Unfortunately don't have anything available from home as a practical infinity point to focus on, but found a tree about 1km away and got the mirror position for as close to middle travel on the focuser for my available eyepieces.
Will be fitting the cell in its (hopefully) final position, then disassemble the first tube for painting and on to the mount
Progress on tube number 2 is on hold as I still haven't found a second focuser, but all the other parts are being made in tandem.
I'm very hopeful from my 'distant tree' test that these are going to be capable planetary scopes. At f/10 the magnification from even my longest fl eyepiece is pretty high. Intrigued to see how well these hold up for planetary compared to my GSO 10" f/5.