I will be returning to MPAGD shortly but as work has been done on engines and compilers for Coleco, VIC-20, Atari and ZX81 those will probably be the next machines to be added. I do intend to revisit the Next engine but in the meantime if any Next developers want to add all the OUT instructions needed to EngineNext.asm just let me know and I'll start thinking about block and sprite editors