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First thing, as mdbokc corrected me, be sure the chickens are NOT in a draft!!! I guess I was thinking ahead of myself or something. Sorry for that big mis-type!
The trick to chicken ventilation is that you need LARGE expanses of ventilation with wire mesh covering the openings. The gable and roof vents will help, but you will need several of them to equal a 2' window and a 2' window really isn't adequate for the number of birds that you have and will have.
Does the building have any soffit ventilation....basically an open area between the wall and the roof junction where the roof rafters rest on the wall and create a gap?
Is the building concrete block, wood sided, tin sided?
What is the roof? Tin, shingled, ???
If you have to cut the old windows out and replace them with some recycled windows from Craigs List or salvage yard it would end up probably costing the same but would be more worthwhile. You could even add a little homemade awning over the window to block the rain.
Whatever the case, I think you pretty well know what the problem and the direction you must go in to fix the problem. Install the vents as ya'll are planning and see how it works, then proceed on to the windows if you need to.
Best wishes,
Ed