Must be a Lefty, whines and complains when someone has a different opinion. 🙄
Look, I suspect your dad will be seriously upset if you destroy his motorcycle, Keep it as is for your dad . Ride it to his house every now and then and find something else to mess with.
You already tried this once, it didn't work then and it won't work any better this time. It's a 35 year old potentially collectible motorcycle with practically NO parts available.. Maybe nose around at VJMC, find out if they are desirable as collectors
https://vjmc.org/
As for Mods... As I see it, there are only 2 rules: 1 Does it work at least as well as before? .preferably better than before.
2 Do you like it.?
Everything else is just someone's opinion, and they are entitled to it.
Mine is that removing the rear suspension for "cool" struts does NOT qualify, nor does a small, hard seat in place of the original. Or removing the fenders to essentially make it un-rideable in the rain. etc, etc.