That thermostat switch is £10ish of finest Chinesium. Purchase was a triumph (geddit?) of hope over experience. Your plan sounds MUCH better.
The hood fit is a bit TADTS. I think it could be improved - I didn't fit it - but the window seals will always be crap because BL. When I got the car, the back rail was missing, and I fitted the new one wrongly. The hood is supposed to be glued down to the rail then male press studs fitted into the hood. This is so you can fold down the hood then use a hood cover or tonneau.
Folding the hood is shown in a few YT vids - you basically lift the centre part and fold it back over the boot, then fold the lot behind you into the space. Easier shown on a vid.
Believe it or now, your Spit is rigid and rattle free compared with others I've driven! Good job you never drove it as I got it, missing the dash support, steering column brace and lower column bush 😉