Unused 5.25 bay, place for GPU?

[elidell]

I have this huge case of which none of the 5.25 bay slots are being used.  My Board could allow 3 GPUs with out pic extender, if I didn't care that two of them would be really close to each other.  That got me thinking, what if I used an extender and put my third GPU in the top BAY slot which conveniently has ventilation at the top.   

Then I stumbled on this
http://www.bplus.com.tw/Adapter/PE4F.html

curious as to peoples thoughts?