Wind has dropped here and myself made good progress yesterday finishing the floor over the B pillar and the bottom door rubber retaining section.. so all closed up now and RC800'd'ed'ed.
I use a small pick set, like scriber point size with a hook end, Stanley modelling knife blades for scraping out (like a Swann Morton but a bit more robust), small 3/8" chisel, larger 1" chisel, 1/2" and 1" wood chisels with edges rounded on the bench grinder and re-sharpened on the stone.
I also find useful a well worn - thus reduced diameter - 1mm grinding disc useful to get where the new 115mm ones won't due their diameter. If good quality like Hilti or similar, these 1mm discs can flex a bit dafely and be used for cleaning, grinding, shaping rather than just cutting... just wear a good full face mask and leather gloves... was wearing gloves for cold the other day -obviously synthetic, not true suede - and just the sparks from the scurfing flap disc burnt a massive hole in the back of my left one.. thought I'd ground my hand away!!!
Faithful are doing some thicker (more multi-layered) flap discs for scurfing, that last longer ... with my new cheap DeWalt, a great combination.
I use a soap bar to clean the powerfile belts and flap discs from time to time, at least once before they're totally worn down...
..and of course, never forget the original hand-tools, the 12" hacksaw with 24 or 32 tpi blade of quality, will leave many flounderingw ith grinders well behinmd on the accuracy stakes, saving ages tidying up. and of course a very wide selection of hand files, from large half round (v.difficult to acquir these days, think Google Nicolson, US maker) right down to a file that I've had since aero-modellling in the 60's.. a very thin flat sem-flexible that will go between spot-drilled surfaces to deburr, so they come down flush and flat...
Been using this a lot too, to close up the floor overlays when spot-MIGing..
the full story...
https://club8090.co.uk/wiki/Ge ... _Home-made
You'll never get the strength unless surfaces are really nice and flush and holes deburred properly when spotting, puddle-MIGing and especially rivetting, so a clamp abs.right.next.to the fastener or weld pretty essential.
Hope some of this helps with ideas.. IMHO, you can't have a wide enough variety of tools, though some tend to be used a lot more than others.