You have to weld up that guesset anyway... I'd just weld them on. For the time saving and added strength, if yo uwanted to remove them later, it'll just be a cutoff wheel and grinder.
I'm never a fan or drilling holes in the frame. JMO.

With 200+ Billion electrical parts, the world most complicated machine is inside your own skull.

Question Reality.
-----------------------------
'89 Rnr DLX "SR4.5", 32s w/ 5.29 locked f/r blah blah