Hi Ales,
If FRM had you steered correctly the first time, the Super Mini DIY kit was a kit from GR-Research (check FRM's links to get you to the GR circle here on AC). These speakers used two planar magnetic drivers - a revised neo3 (like the original from BG) sourced directly from GR Research, and a BG neo10. The reason there isn't much for info on these is that availability of the neo10 has been spotty at best. In any case, checking in to the GR circle and with Danny over there (owner/operator of GR) should get you squared away. Assuming you can get the neo10 midranges you need, you'll get the rest - including a flat pack of the baffle parts - from GR.
Welcome to AC!