Any plans for a face plated version? I don't see non synchronized being that much of a drawback on the street, and definitely more reliable at the track. Our Land Rovers are non synchronized on 1st (you start out in 1st, too) and 2nd and they are daily drivers. You should see little Michelle going up and down through the gears in her 88. Maybe use something like the road race sliders in a Jerico DR4 which work better on the coast side.
Cool product. I like that a potential leak source is gone in the front by not having the countershaft be bored through. The tapered roller bearings should quiet it up by keeping everything that much more in line, which I imagine will elad to more longevity. Lighter too than an original A833 iron case tranny.
The 23 spline thing is a non-issue, just get a new disk or have the hub of the disk changed, minor in the whole scheme.
As far as price, people need to check out Jericos, Liberty, GForce 5 speeds.
