I'd upgrde this design slightly with button-head stainless allen bolts and with stainless Nylok nuts so they don't come undone.
And I apologize if I sounded condescending at all. I didn't mean to be. Straps are a learned skill. It's one thing to have someone holding your saddle on the start line while you can lean down and fix the lower pedal carefully and patiently. When you are rolling out and trying to do it, or doing it one handed while holding onto the rail with one hand, it can be a pain. Definitely spend the money on high quality laminated straps like the MKS Fit-alpha because if nothing else they tend not to flop as easily. And if you fit a double it definitely makes it easier to slip your foot in. The thing about doubles is that you need to engineer a second bracket for the second strap or they sometimes have a tendency to slip around, and if you have small feet, you simply don't have enough real estate on top to accommodate both straps. Oh, and if you have BOA fasteners or buckles on the lower part of your lacing, they get in the way of the second strap.