Well technically I don’t care and I’m not all up in arms…
All I’m saying is I’ve been there and work as a fabricator and have done my share of machining and it would be down right ridiculous for me to spend the time, effort and material to make something that I can buy for $80.
Now if they were $800… sure I’d be making my own.
And after trying to think about your “twist” all I can think of would be making them thinner so that the Subframe sits closer to the floor “which would lower the rear end by raising the Subframe slightly” but would also make clearance issues between the Floor, Subframe and Diff.