There's loads of Boardman Hyb 8.6 s around of facebook for <£200. I'm converting one at the minute and it has hydraulic brakes, nice big frame triangle, square taper BSA bottom bracket , fixing points for a rear rack and mudguards , 11.2kg - ideal donor bike
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Ok, was pretty straightforward, 280rpm 36v tbk-100cst (claimed 30Nm !) + Hailong 17.5 ah 36v Panasonic battery
Total weight including battery (according to my luggage scales) 16kg
Wheel built by arrow wheels, they did a good job
2 things that stopped it being completely trivial,
1) motor didn't have bolts for disc rotors and standard disc rotor bolts are too long so I had to order some
2) I got the motor with a new 9 speed cassette, but I couldn't index the gears correctly, so I swapped to the old one from the rear wheel I removed, all worked perfectly then.