Heya, I'm new here after discovering this awesome little console as a result of finding some Pokemon mini console/game manuals in a box behind my alley, and am very much interested in getting a cart and doing some development!
I do game art (specializing in pixel art but also just about anything art related as well) as well as gameplay design, and my husband's an electronics engineer (primarily PCB design but also software, drivers, reverse engineering, all that).
We used to do homebrew on the DS, but our house was robbed and we haven't replace our hardware since our backups were taken as well as the PCs which had the original source files, so it kinda killed our drive. My interest in this little console is very much piqued, and while my husband is too bogged down with work to team up on something with me, I'd be more than happy to work with someone here, and needless to say I'd have no issue assembling a cart from scratch on my own over here (even if it's a prototype that needs testing).
We get stuff via digikey on a weekly basis (we're in Chicago, US), and I can get boards made for super cheap, so I'd be happy to pitch in if I can be of any help. While I myself don't do the engineering in our house, I often help out with assembly on short order runs.