I'd be too scared to plug my own PCB to a $3000+ system to be honest. Especially when any damage resulting from the custom HW would most certainly be outside of warranty repairs.
that's a good point to other potential punters out there. i have access to a fairly extensive testfloor setup, so there plenty of electrical analysis and test will have been done prior to first 'plug.' but, yeah, i wouldn't think many end-users will design their own 'xorro' boards; if there ever are any, i imagine they'd come from vendors.
all the more reason for folks interested in 'dipping their toes' into the XMOS waters to start with one of the USB-hosted development kits along with XMOS' IDE running on their PC. if it's still something they'd want to pursue on their X1000 thereafter, so much the better.
but a few of us -- especially those of us in hardware engineering -- have an interest in this. i think even @koft had a passing interest in XMOS. i'd love for folks to discuss kit they've actually produced. i'm restricted by confidentiality agreements on talking about the two projects where i've actually used xcores, so the HF receiver setup would be my first private project. it's just one of those 'because you can' things.
the whole 'power of X' thing always seemed more marketing than anything else to me when A-EON unveiled the X1000 last year: i don't know if many people will find it a genuine value-add beyond the geek cred its presence lends to the system generally. but there's real potential there, and a cool-factor. and at $3000USD, you'd want to be something 'different' anyway.
as an off-topic item, i do have to congratulate you and the MOS development team on the build of MOS v3.0 i saw running at amiwest this year. very, very impressive.
-- eliyahu