I have a (quite old) concrete sectional garage and am wondering about
converting it for use as a workshop. My main question is this: would it be
possible to remove several of the 16" wide sections from one of the long
sides and replace them with a timber frame which could hold a door and a
window? I'm thinking that this might be easier than cutting two separate
openings into the existing intact concrete wall.

The panels are bolted together near the top and bottom, and are also fixed
to the wooden beams supporting the (corrugated metal) roof. I don't think
they're bolted to the concrete base: they appear to be kept in place purely
by their weight.

Assuming that I could undo or cut through some of the bolts (and release the
fixings to the roof beam) could say three or four of the panels then be
removed without affecting the rest of the structure? There would still be
several panels left standing either side of the gap, and that's a huge
amount of weight to leave relatively unsupported, even for a short time: I'd
like to know in advance that everything would be stable while I fitted the
timber frame.

Many thanks.