You know, my modification turned out quite well and I wasn't going to take time to share until now. I didn't want to spend 5-6 hundred on a new bimini when I already liked the shelter from the original (usually quite bigger than tower biminis). Anyway, if you look closely in the pictures (before and after), all I did was create a new center bow from 7/8" conduit from Lowes and made an S bend to fit "through" the tower. I measured the tower width at the height where the bimini was going to be, marked the conduit after some number crunching (knowing your pipe bender will give you about 5" radius or as specified) and started bending. Later I realized I probably could have just angled it in to fit under/through the tower but I wanted max. width and height before bending in.
The front bow was easiest with just two bends. I just picked a measurement wider than the tower and close to the original bow but just angled the sides in to clamp to the tower. Picked up some 2" conuit clamps at Lowes, some new Stainless bimini ends at the local marine shop, a couple bolts and wing-nuts and it's done. The front bow straps still attach to the windshield but it can be further modified for no straps and use support rods that attach to the tower. In all, the job cost me around $30! With the most expense coming from the stainless bimini ends - the framing (conduit) cost about $6.
I'll get some close up shots soon and post them.
I did start a new string about mounting speakers on top as you can see there's no room for a set of Fusion speakers. I also debated lowering the tower, but with me at 6'5" I don't want any loss of headroom! But yes Tom, all you have to do is chop down the rear supports (depending on your type of bimini/tower). Shouldn't be too difficult.