pocket window replacement

I want to replace my old wood windows with the weights with pocket replacements, but I don't want to lose anymore window glass area. I have 3 sets of 3 double hungs (22x60). Each set of 3 is divided by two columns where the weights are located. Would I be able to get a larger pocket replacement and build out the frame where the weight columns are so that my window area is the same. I hope this makes sense, any ideas would be helpful.



Thanks

Brian

pocket window replacement