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You're welcome to borrow my belt sander
I think this is a good solution.
I don’t know if a hand saw will get any closer than a circular.
I’d be tempted if I were short on tools to make cross cuts with a tenon saw to as close as possible to the frame then knock off with a chisel- keeping an eye out for the grain wanting to take your hewing past the cuts (if that makes sense?) then finish with the belter.IME (v painful) cycling with a big belt sander and other hand tools in a shoulder bag is a BAD IDEA. Especially if you need to stop suddenly.
But I guess all the kids have proper racks and ting nowadays.
@hugo7 for the wooden sill, I (as a rank amateur) would go for some kind of hand saw (whatever you have, or a cheap flush cut) and get in as close as you can. Then a belt sander to flatten it off/bring it in closer and finish with hand sanding using a block as @Airhead says. Will take a while, but it's currently the weather for it.
You're welcome to borrow my belt sander if you're willing to make the trip down here again. I've moved, but only a mile away from where you grabbed the timber.
"grabbed the timber" fnar