So I have to ask, how do you plan on putting a light canopy on a bowfront? That is the main reason I never went with a bowfront.. too hard to make a canopy that fits nice and can hold MH lights. It can be done, but more work than I ever wanted to tackle. At the store I work at they have a 175G bowfront and installed a $3000 Solaris LED light on it as well as 2 T5HO's in the "bowfront" part of the canopy because a rectangle light fixture didn't put out enough light for the bow part of the tank. Still, it is only a "softie/LPS" reef tank because the light isn't enough to do SPS corals. Even the owners of the store couldn't figure out a easy way to add MH lights to the bowfront with the short canopy that came with the tank and stand. It is only about 6" tall so it is too short to add MH lights and rebuilding the canopy was too much work even for them.
Also, what about the overflows? Are you going to look into getting it drilled and have an overflow built in? Probably looking at $300 to do that type of job on that tank and still a scary thing to do because of the risk of breaking the tank when drilling it.
Personally, that tank would still be a Fish Only tank due to lack of overflows and lack of reef compatable canopy/light. I wouldn't make it a reef tank at all... just way too much money to do it correctly when you can buy a 90G rectangle or even a 120G rectangle tank that does have built in overflows. I think a nice standard 120G reef tank (without a stand) runs around $350-$400 new... stand adds another couple hundred to the cost though unless you build it yourself.