I finished constructing my MAKERbuino yesterday. I followed your instructions and everything just worked. I made some photos as I was soldering, and I’ll see if I can post some in the next few days.
I started my computing in the days when 8K was a LOT of memory, so I am enjoying being somehow back in that time with the MAKERbuino. I will code it using my Raspberry Pi 3b+, which I use for all my Arduino projects.
I find the concept of MAKERbuino intriguing - a self-contained Arduino, with battery, display, sound, input buttons, data storage and ample connectivity. It provides an interesting platform for creative ideas.
To your question - I bought my Inventor’s Kit from Sertronics GmbH here in Berlin, an official Raspberry Pi supplier, and they always friendly and helpful.
Thanks for creating such an amazing project!