@MIGLIACARS.........."tell us about the box"
Ooops.....
This started about 5 years ago with finding a BMW K1300 engine with a damaged gearbox casing in a garage clear out.
The engine was mated to an Imp transaxle, which left me falling over a gear box that was somehow too good to throw out.
Missing out on an ebay 5 speed Jack Knight, I got out the drawing board and started taking measurements. The cluster would fit in a Mini box, but because I had to incorporate a solenoid activated syncromesh between it and my reverse cluster, it is just 6MM too long, but that is without bearings on the fly wheel end of the shafts.
Chopping the casings in half enabled a friendly local welder to get at unwanted holes and insert two 20MM plates before machining away all of the web below the drop gear's bearing and most of the center web
I was over ambitious. Squeezing in six gears has compromised bearings, taken a lot of welding and machining to fit the half round oil seal under the front main bearing and we had to have 3 attempts at cutting the output shaft, but that was nothing compared to making the selectors.
The Drum had to be moved round the cluster by 140 degrees, to where the oil pick up filter resides, and the selectors have to be very slender to pass the lay-shaft.
Even with a dummy flywheel end which enabled me to get a bit better view of things, I had to remove it and the cluster, many times to cut and braze and re-braze the selectors.
It works, but I wouldn'd do another one. Apart from saying that "I did it", it hasn't really been worth all the effort.
Having said that, if I were younger and from what I have learned, I recon that I could get the 5 speed cluster from a K1100 into a Mini box, but without a dummy end, I don't know how I'd ever make the selectors.