I was wondering the same question (sort of) before I rebuilt the motor in my 87 gxl.
I research all I could find on bridge porting an a little on street.
I have a mild street port in my 89 gtu.
I wanted something different.
So in the end I got something really different.
I combined the ports in each end-plate a little, aka siamese port. 
I still want to do a bridge port some time, maybe on a 12a.
But your doing this with a turbo. Good luck.
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'89 RX7 GTU, half-Bridge-port S4/S5 NA, E6K, Full RB exhaust, weekend warrior.
'83 RX7, The "this might take awhile" project.
'87 RX7 GXL, Rest In Pieces.
'98 Subaru Impreza Outback-sport, rx7 rescue vehicle, down for repair.
'94 Ford Ranger, daily.
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