I have 2 F355 Challenge Deluxes. Wanting to convert them to use F355 2. As for stretching, it doesn't work like that.Gotcha.
The Deluxe models use a board stack. You have a 2 naomi's on the bottom. Then each has an interconnect board ontop of that. These interconnect boards join together. There is another Naomi ontop of that. Then, on the left side you have a comm board, and finally the rom board. One naomi runs the game logic. Then each of the remaining 3 runs a separate monitor. I have seen instances where it will boot the game with one or two monitors not receiving signal, but the game usually complains that it is set to the wrong type.
@dung in theory - yes, + crack game protection
Any suggestions about how to research cracking the game protection? Goal is to add at least 1 pair of the twin f355's and tracking down 3 f355 2 carts is highly unlikely.