Hi Chris,

> I don't know if there is "room" in any of the current formats
> like IGS, STP, SAT etc. to incorporate this.

Not really - although there is some room for sticking in custom data into some of these formats you would need to get a lot of CAD vendors to agree how to treat the custom data all in the same way for it to actually work for data transfer.

That's a pretty tall order because it is difficult enough just getting everyone to handle data that is part of the official spec as it is.

- Michael