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Been some progress here. Waiting on PCBs to arrive (OSH Park so coming from the US). Will post the schematics, pcb layout and verilog soon.
I have taken the approach of a "breadboard" PCB design so only the A[] and D[] lines are tracked through. Everything else is jumpered. @14 or 28 MHz I consider such frequencies to be low enough to be OK (I was running the DPI of a Raspi to a TTL LCD via quality jumper wires at 32MHz pixel clock and it was OK).
P.S., I have another idea of a SRAM based Kickstart chip using a small micro to load (from a serial flash) a kickstart image into a SRAM and have the serial flash updateable via the amiga. Micro would hold gary in reset until SRAM is loaded. CPLD and a couple of shift registers to do the A[], D[] and control should suffice. 512Kbytes on a 20MHz AVR should be pretty quick!
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