Sounds like a winner to me.
I've just been looking over some maps of the various stages of the action. It does seem that a 'Warsaw Master Map' would be the way to go, perhaps 2km on a side, possibly centered on the Victoria Hotel?
The question then would be how to structure things, should it be historical or should it go the WHIF route described above? The attack on the bridges took place pretty early in the uprising (17:00, 1st August), so the designer would have a reasonably free hand with any scenarios that followed. The successful historical attack on the railway station in Praga could be incorporated into the storyline to provide the AK with a bridgehead on the east bank of the Vistula.
With the Vistula bridges under AK control the Germans would be facing a massive problem and the Soviets a golden opprtunity.....How might they react?