One of my shopping stops on the east coast (mass) the seller of a 601, had a thiokol Spryte A model (which has the OC 4 as a OEM diff) and a model 2100 very wide machine like snow tracn nome, merged into one cat.
He cut all the axles and narrowed them to Spryte C model width.
He installed the 2100 diff and sourced the outer axles accordingly.
I was inexperienced and was not catching all of the modifications, but his project was cool and did not seem that technical.
I have come to the realization that I can build a machine to what I want and need.
Although if I won the lottery, I would be the first person bankrupt due to unfinished projects...... I would be sober and tired, but dead from exhaustion just the same.