No offense taken, but did you actually crawl underneath and take a look at what's really involved?Sorry, but I wouldn't do this without welding. Self tapping screws? Really? I'd also go with grade 8 bolts, cuz why not?! Sorry, but I don't like your repair. That's just me though.
This repair worked for me, and is still working after more than a year. The self tapping screws serve to hold the repair saddle and large plate washer in position, and the half-inch grade 5 through bolt does the real work of pulling everything together. This repair works by sandwiching the the rusted out connection with a plate and saddle, and bolting it all together.
The unit body frame is not very thick. You need to be a very good welder to run a good vertical bead without burning through. I'm not that good. It is also impossible to access the front of the cross member to weld it. And, I didn't see the need to start my Pilot on fire.