I've been following your work in the past around the circles, assembler benheck etc.
The biggest piece of advice, that I've mentioned to many who have attempted this is to invest a tiny bit of time and research to find a va2 Dreamcast.
Those, the last revisions, have the entire gd-rom subboard integrated into the motherboard. This makes portabilization a MUCH easier prospect, and despite rumours, they are MIL-CD compatible.
Good luck finishing up.
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