I picked up an Ironhorse Maverick Elite (2007) and it seems to have a great frame for electric conversion. The derailluer hanger is 3/8ths inch thick steel on the drive side, on the disc side the dropout is 3/8ths of an inch thick also.
On the aluminum dropout side, I can bolt steel plates as there is plenty of room. No problem mounting torque arms either...the raised swing arm gives a ton of space to play around with.
The full suspension frame reminds me of downhill bikes (what Ironhorse builds mostly) Although the beast is 6061 aluminum, the bike bends the scales at 36 pounds! The swingarm looks like the truss off a bridge so I think it will work well as an electric conversion. The front fork works well (Rockshox J4) using steel stantion tubes and steel steerer for durability. The adjustable suspension travel (80 to 125mm or 3.2 to 5 inches) allows slight changes in handling. My plan is 24" wheels for extra strength, would love a "stroke monkey" arrangement by tucking in a hub motor in front of the rear shock. The rear wheel will be a Fallbrook Technologies continously variable hub so I can ride up mountains and get some speed on the flats. LiFePO4 batteries with maybe 48V 20Ah rating should do it. Hope I can get those PHET automotive 12.8V batteries and use four of them.
At this point, I am converting the bike over to 24" disc brake wheels to check the durability and handling. Anyone use a 26" front wheel with a 24" rear? That is how mine is at this point and it handles very well. The dual 24" wheel project will be complete in two weeks as my son likes using that size for a "jump bike". The best way to check for durability is to use a teenager.