Ask the people at Elektor, they have a huge European / American / Global circulation and are always looking for advanced projects to publish. They have PCB / kit support too.
Yeah, I'm a subscriber. I've also thought about seeing if Circuit Cellar would
be interested in a project (of course they are now owned by Elektor).
For me it comes down to I'm working on some projects that someone else might
be interested in. I don't want to run a business selling kits, and I'm not quitting
my day job. But if I could earn a little chip money (what others would call
"beer money"), that would be cool.
Maybe there's no market for advanced kits. I haven't found much out there.
I'm currently building Scotty's Spectrum Analyzer (different Scott):
http://www.scottyspectrumanalyzer.com/It's not offered as a kit, so it's been slow going for me to source the parts
and build it. Luckily, a nice fellow in Australia built a cavity filter for me,
because I was pretty sure that was going to be my epic fail moment :-)
At the top of what I'm working on (meaning at least in schematic form if
not debugging a prototype), some projects I need for myself:
-- Stratum 1 NTP time server with simple hardware (basically FPGA and
embedded processor). Optional support for IRIG-B time code output
and (maybe) WWVB as backup
-- DDS signal generator with touchscreen interface and ethernet (not GPIB)
connectivity supporting LXI
(yes, I like putting ethernet on everything)
And just for fun, a retrocomputing project
-- CP/M system in an FPGA with a VGA interface virtualizing a VT100 terminal
in a window with register displays and virtual toggle switches, kinda like
the old Altair 8080
Scott