spiral balance hardware

We are building a concrete block house. Any particular reason we cant just have the windows and door sized to a replacement window rough opening size and then install window and attach straight to concrete block then caulk ? Treated lumber is better than regular kiln dried but eventually will have to be replaced if not properly dried, treated and then wrapped. It seems to be a good idea to install vinyl replacement windows directly to the block and then seal. Thanks

I have had three local firms in to mend windows. They are of the sash type and have metal spiral strips the length of the windows on each side. When the window is opened, the spiral does not rise with the window, it has freed itself from the inside top and remains hanging down. The window of course will not stay in the uo position. On each occasion when supposedly repaired, the window did not have to be taken apart. Initially, these spiral strips were encased in a rubber type sheath which has either rotted or perished away. Since I presume these were actually cosmetic rather than essential, they were not renewed. It didn't seem to take much time when the repair men were working, about 20 minutes per window. At this point I wish someone who knows how would come over to Nassau, because it seems beyond anyone local!!!! Any ideas of where I could find instructions would be heaven-sent.