inspired by crossbreaks' mac/bafang mid drive conversion, i know want to make on as well. i have a mac in the rear wheel of my bmc trail fox, which will be converted to mid drive, and may be installed in a kona entourage.
this bike is available with a really high discount at the moment, and has decent components installed. some good, some heavy, but overall quite nice.
i don't want to have the motor in front of the bb, but behind the bb. this give imho more stability of the frame.
problem: the entourage's rear wheel almost touches the bb. so i will need to make new cross-ties between bb and rear axle, and rear axle and bar which moves the rear damper. those will be made out of steel instead of aluminium as i feel safer that way.
i know the bike will not be as lively as before, but it's NOT meant to do freeriding or downhilling. just a nice bashing through the woods
battery could be 8x 6s 5800 zippy or 8000 or a mix between, connected as 12s4p, so 48v and something between 23-32Ah equals around 1kWh of energy. motor should be around 1.5kW with a 9gear cassette in the rear (14-42 teeth) giving a perfect gearing for 18km/h full speed in lowest gear and 55km/h in highest gear.
this is a first rough sketch: