To integrate things on the same pcb takes some layout work.
But if lordv would make a DIP-64 version of the DRAM-board, you could stack it and other kinds of expansion cards as a "tower-sandwich". Well maybe not if the Amiga mainboard is in the original case. (A500, also CDTV has little clearance, A2000?, other dip-64 68000 systems?)
Edit: @Jeff, How much is there free space inside the A1000 in the "upward" direction starting from the mainboad socket?
