Hello sir.
I am interested in taking the riscduino project further.
Could you please share your email so that we can keep in touch better ?
I have extensive programming experience but I am new to the VLSI field.
But I am a quick learner. 
Here's my plan:
- build the riscduino SoC for an FPGA - I have the ULX3S board
- see if I can get the arduino bootloader loaded into the SoC
- and use the arduino IDE to program the SoC
-x-x-x-
Also, will check out if getting micro-python / circuit python loaded onto the SoC is possible, 
- if possible - try it out
- if not possible, then see if I can tweak the memory capacity to get a capable SoC.
-x-x-x-
Please let me know if someone is attempting this already, so that I don't repeat their work.
Regards,
Sanyam