its a cement/poured style foundation.... i will patch it up with some cement but the old window is single pane and metal frame... not worth a shit anyway...

uploading pics right now

these are pics from inside, obviously....

i climbed on a bucket, this is the window from over the cistern

next 2 are the cistern itself, it is about 5' tall ceilings are about 7'


and another of the window, you might be able to see the gap at the lower right corner of the window. also take note of the 2 pipes running parallel to the ceiling, we have hot water radiant heating ... those might get in the way a little bit too...