I have some pinouts I made myself but they're a mess (and you may already have them
) Also, there are no 8mb GVP sticks. They only come in flavours of 4 and 16. Almost all GVP stuff I had had jumpers to set 4 and 16 mb sticks, so you can't mix-match them and there's no auto recognition, so it shouldn't be too complex really. Also the GVP hack at Aminet is only re-routing of signals (no logic involved) so it should be possible. There was only one issue of OE or something to be solved, and the guy had to connect it to Parity line or something, can't remember right now ...