I converted a bike 5 years ago to a Bafang BBS02 48V 750W middrive. I hadn't ridden it for two years and recently started using it regularly. I had forgotten how nice it is to have a bike with quick release wheels front and rear. as I have been changing tires on my hubmotor bikes. The hubmotors have 17mm nuts and often have torque washers.
In addition when converting a bike, the controller in a Bafang is inside the motor, so there is no need tp figure out where to put a box on the frame, dress up wires, and make it look presentable. While more and more hub motor kits are moving to plug-n-play connectors, some of the kits are a distressing jumble of connectors to sort out. In contrast, a bafang is fairly quick to wire.
Luna has the potted batteries which might work, although they are 52V and I believe the latest Bafang motors are quite touchy about going that high.
Diamondback Wildwood with BBS02.
Looking down at the chain line.
