Nice job! Of course it would take a Canadian to come up with an idea like that

Great idea! I'm not sure the side mounted one would work well (especially with frozen siding) but love the top mounted one. I've got 20 yrs in residential construction and that's one of the best ideas yet.
I disagree with RitchElbe. I can control my hammer as well as anyone and I wouldn't think twice about using one if I did siding regularly. Big difference between shingles and siding. Shingle gets nailed tight so the single will give you some resistance to over tightening, not so with siding as the nail has to stop before it contact the siding.
Dual sided with a top mount and flat face please. Or better yet, add side mounted claws in the middle of the head and I'd take one just to have available for the odd time I still do siding