Installation wasn't the smoothest. There is no way to access the outer holes from underneath, so I drilled a 1 1/4 hole to get access to these. It would have been better to drill a hole for each bolt, it was a fight to get the bolts tightened down with the angle and no room to work. But it is possible.
When you drill through the top of the deck, you with drill through 2 layer of metal. Then you have to drill an access hole underneath to install them. The screws they supply are very short, not long enough to use on the outside in 2 of the 4 holes. I will have to find some grommets or hole plugs to clean things up.
Overall, the appearance is very nice. Surface is smooth and paint is good. I would say this is on the edge of too much for the casual DIY garage job, but possible if you take your time and have patience. If I did it again, I would have drilled 4 smaller holes on the underside instead of 2 larger holes.