No, not yet, but Ill consider it, in fact my Rhococo project has stalled a bit because the bit-banging software needed to get SD card reading has me stumped a bit, and in fact I am now devoting my time to finishing my ZX81+35 project (designing the keyboard PCB) so for the moment Rhococo is stalled a bit.
I could use some help to restart the project, especially with the propeller code needed for SD-card reading (bit banging the SPI code over the I/O expander), as my strong points is not software development, but rather ideas and hardware.
perhaps the idea to begin by installing SD-card reading code wasn't the right idea, it was inspired by computers that loaded code like a BASIC interpreter from tape (SHARP MZ80 series) so the basis of the computer was just a monitor with tape loading code, as a simple way to bring up all the basic capabilities of my rhococo.
I had hoped I could use the ability to load in code from an SD-card as a starting point in testing the ability to upload and start Z80 code, and to develop the ability to write Z80 keyboard drivers and I/O handlers. So without that ability I would have had to circumvent that idea, and use a more direct method to upload (some) code to the Z80, to see if my hardware design would work.
But if you are unconcerned that there might still be undiscovered hardware issues, i'm not agains the idea of sharing my as yet unfinished hardware.....
In fact I already decided that the best way forward would be to release what I have early and often.
in Fact that is what I do on my Revspace wiki project pages at https://revspace.nl/Projects
you can read almost day to day progress reports about my projects, only the wiki is unsuitable to release files, as its restricted to open-office, pictures and .PDF files, not to CAD files and gerber files etc. For that I will need to use GitHub.
watch this space for news....
p.s. Yes, the list you mentioned are also some projects I was following with interest, except for the dual propeller game system, which was new to me, thanks for the link..