I just wanted to post my install so far. I've been swapping my 2014 over to a 2017 chassis and decided to go with these boards and see how they work.
First off the part sheet in the box says the rivets are supposed to be black to hold the cleats on. They come silver so I painted mine for a little cleaner look. I elected to cut the factory rivets off where the two layers of tunnel meet on the bottom. The new boards use good Huck rivets up through the bottom and serve the same purpose once installed. This is a way easier attachment than the previous BDX/Cat boards that rivet through the side with spacers. These boards are the same width as my old BDX ones (both narrower than stock and same as mountain cat) except right at the front where the bar goes straight up to the tunnel instead of out. This is the key to being able to suck the belly pan in. I had a bag of Skinz traction screws laying around so they are being used on the outer edge. The wall thickness here is a little less than what Skinz boards have, but about double the thickness of the factory edge.
Minor trimming of the brake guard and the belt guard are needed up front. If you're doing the MC drop and roll like I am I advise buying a MC brake cover since the holes don't line up anyway.
Fit with the boards wasn't quite as nice as I would have liked. I was able to do the install on my own but I used 3 clamps moving them around as I went. I will disclose I'm pretty meticulous and make sure everything is perfect before I'll drill or rivet anything. If you're going to do touch up paint on the edge then get the rattle can from Cat in the right color so it can be done right after the cut. I did mine after the fact with the small bottle and nail polish brush takes way longer.
Its hard to get an accurate weight of these with all the rivets since the nails are separated from the mandrels once the rivets are installed. I put about 1/2 the remaining rivets on the scale to try to account for this. What I do know is the 2017 MC chassis was 27.84lb, 2017 MC chassis and cat mountain pro boards was 32.1lb, and 2014 SnoPro chassis with BDX boards was 33.3lb.
Overall I'm happy so far. I'm running the new cat front end with 38" stance and everything is tucking in behind the line between the rear bumper corner and the spindle.