We already did, years ago. :D
My car looked like **** underneath and even had the single exhaust with a glasspack and I still did the connectors even before I fixed that stuff.
The front looks like a big nasty weld but it's actually two welds side by side.
There is a section of angle welded to the tie and then the weld to the frame.because I literally wanted to tie into the front section and not just the rear face of the cross member.
I still have not cut and closed in the rear of the ties, but the ties are completely enclosed like the diagram shows.