Gen 3 is not rare, well maybe in Austrilia but defnatly not in NZ
GEN3 onwards can be stood up, gen 1/2 not worth standing up, unless you like muching bearing constantly
I have been there done that
Get a gen 3 or forward motor and you fine
Gen1 and 2 is wasted of time
I have pics of my gen 2 conversion if anyone wants to see