no enclosure is to big! none at all.. being able to provide it with as near to its natural enviroment as possible is fantastic! but you must make sure it has adequate hiding spots.
people that say something is to big for a snake just annoys me, its ignorant and selfish!
if i could afford a 110 gal setup, i would do it providing i could keep the entire thing heated and at the right humidity all the time.
before my Boa was even 4ft long i had him in a 8ft by 4.5ft by 4ft custom tank set up and he loved it! of course he got HUGE! and needed it regardless but it took a while!