A999 as a street/strip trans.

That is the 2nd time I have read the slant 6 pump/input shaft thing. Does it have to be slant 6 999? Or any non lockup 904?
I have a brother in law that is a machinist ( but not a transmission guy) and access to a large lathe and mill. Can we just copy the dimensions of the 999 pump for those 2 changes?
Watch your terminology here. The pumps are all the same, it is the stator that is different. There are two halves to the pump assembly.
The one half is the stator. The side with the rotors is the pump.