^Brilliant work been reading this thread for a while-but only just joined this site.
I have a M103 Mosselman TT aswell, the original management has packed up so using the same Split Second unit as RBYCC as recommended by him.(thanks Ed)
Need to source a 2nd hand plenum to get machined to mount the injectors.
How long did it take you to make your plenum out of fibreglass? also what injectors are you using?
and once again brilliant work!