I'm new to this forum. I've been checking out the Luna Cycle page with an eye towards converting my Surly Big Dummy to electric. I believe the stoutest and strongest option available while having a smooth PAS system (I'm only interested in PAS) would be the Bafang Ultra Ludicrous edition (I want speed AND hill climbing power). Is it possible for a frame builder to cut my steel frame and weld in the aluminum mounting plate for this motor? Or do they need to fabricate something from steel to work?