I can see where both sides of the fence could benefit from this sort of arrangement. I can also see where Heighway would be putting in minimal effort and getting excellent dividends and the people doing the design work get the short end of the stick.
If this "think tank" has an exclusive agreement with Heighway it seems like a very slippery legal situation as well, in my limited experience. Will these exclusive designers be "employees"? Will their out-of-pocket expenses be tax deductable? Are they going to buy in as part of a "club" to avoid the employee problem? What sort of legal and tax status will this organization have? Would designers have the option to bring designs to other manufacturers, or will they forfeit that when their IP was released for prototyping? Will they forfeit that as soon as a Heighway system is used in the development of their ideas?
Also, as it's relevant- Patents in the US now go to the first to file. It doesn't matter who came up with the idea. Just something to be cognizant of when sharing this kind of thing with a company that is looking to profit from ideas like yours.
None of this is necessarily a bad thing, but I would have to see a lot more than some posts on an internet forum before entering an arrangement like that.