Don't have much advice but no doubt think your idea is worth seeing through. A bagged 99 would be super sick! Good luck on the project.
I've got myself a 99 as well. Had a 98 until a lady ran a red light and totaled her
🙁
Dug the Buicks (lesabre) style and couch like cruise so much I picked up another (2owner and well maintained)
re did the whole engine bay, water pump, tensioner, new suspension, belts, hoses, seals, wheel hub bearings,
intake gaskets(lower+upper)
performance racing plugs and wires, super nice
cold air intake(currently modifying it to have a dual
cold air intake) Knocked the res and cat off put a straight pipe dual magnaflow stainless steel performance exhaust ,mercedes suede interior, dope sound system and the list goes on, bottom line is the lesabres can become something that catch's everyones eyes. Get compliments on her all day. Anything you do to put love and personal touches to it will only bring you happiness. Didn't mean to take over the thread just wanted to say GO FOR IT BROTHA!!

wish I had advice on bagz. Always wanted to see one done. Alot of people don't do much to our years but thats why doing it is so worth it, one of a kind!
Best wishes and much peace