I bought some 10" Celestion drivers from Lean business. They were new (old stock) and ridiculously cheap. Problem is there are no TSPs available and I don't have either equipment or expertise to measure them. They were originally used in the "Substation 10" bandpass cabinet.
I noticed in the "Cubo 12" write up that a) the design was very forgiving and b) that it could work with 10" drivers.
So, it's worth a try but should I scale the cabinet down to suit the 10. If nothing else I think it would be worth scaling the width down a couple if inches, but you tell me???