I like the top of that thing, virtually makes boilovers null. 35qt will be plenty for a 5gal boil, I use a 32qt tamale steamer for 5 gal boils.
It may be difficult to swap out the drain on it, it's worth looking into though if not only for the pot and burner setup.
Two Raven Brewery
[Is finally brewing again!]
Primary1: Envy - Green Tea Wheat (4/11/09)
Secondary: Schwarzbier Kit (1/11/09)
Bottle Conditioning: None ATM
Drinking: None ATM
Up Next: Lemon Honey Pilsner (est. unknown)