Re: hi, newb here trying to learn
Wide Crank Pedal Kit [4S-CDS-WCPK] - $29.99
This is the only one piece extra wide pedal crank I know of. I've used a couple of these on other builds and it's a good unit. The only other option is a three piece crank which requires an adapter kit. You can also sometimes get away with bending a stock crank depending on how much clearance you need. Can't advise you on a cag motor.
Someday when I grow up I will probably lose interest in toys with wheels, but until then...