Ok so I've decided that I'll simply use the brake master from the original master/booster combo that came out of a 1400 bakkie. I'm hoping the size increase of the Almera caliper and Alfa caliper pistons over the standard Datsun/Nissan 1400 fair will help that the brakes won't be to hard. Just removing the master from the booster already makes it push much easier, since you are no longer pushing against that huge spring inside the booster.
Anyway, with this adapter plate I can easily unbolt it and fit back the booster if need be or I can fit another smaller master to increase the ratio so the brakes are softer.
Thought I'd make this plate the old fasioned way, using what I have at home. Used a piece of 8mm plate and stuck a 1:1 print of the adapter I drew with cad onto the metal plate. Then punched the holes and started drilling and tapping and finally just cut it out. The big center hole was perhaps the biggest job, as I had to drill a whole bunch of 3mm holes all around the edge of the circle, then knock it out with a hammer and chisel and then file it out to the right size with a rotary file in the drill.


Test fit to the master. I used some 8mm studs I had lying around to bolt the master to the plate.

Then a test fit in the car to see how much space I gain and I'm sure it will help a lot. It looks good enough anyway, will spray the plate black.


Here's a comparison between having the booster in and out. I'm sure I'll be able to fit proper ram tubes now...


If I'm still short of space because of the bottles, I'll just use a remote mount bottle for the brakefluid and move it more into the corner.