Transfering is quite common as to V6 not easy as they usually have different kits for different number of cylinders. So get a good 2.0 they are OK as long as you don't expect the world from them.
Eg mine is available in 3 or 4, and 5, 6 or 8 kits.
Pipes & olives - how come you know them?
Gas filler you can either drill a hole in the rear wing panel or take the easy way out and bolt it onto the tow bar (take off the wreck) - like mine! HINT HINT! I have a suitable bracket!
Holes lots of them to drill need I think 28mm for the vents. Not sure for the panel fitted one but I will ask.
Keep EVERYTHING off the old install all nuts bolts clips ect, photo it before you dismantle. There will be a lot of wires you will need to run up to 4 wires the length of the car, any cut wires MUST be identified so we can reassemble.
If you get it here I can help I have a pipe bender, electric, jack, drive on stands, but not cover so need dry.
I reckon a few days with you doing a lot when at home taking the manifold off whole sounds good but you ought to keep the better TB and pipes.
The following may not be obvious
ECU (check pollen filter) emulator or cut injectors so check ALL cabling to petrol injectors.
Solenoids - check entire pipe run keep all fittings off the pipe.
Remember pipes at the tank including vent pipes and vent thingy
I have here
Small amount of 6mm pipe, two 6mm pipe joiners, pipe bender, pipe cutter, grommets, heat shrink, soldering kit, a good mains and a good battery drill. Tap & dye set, bracket for fitting a filler onto a tow bar.
You will require, both pipes, pipe clips, jubilee clips, what you can rescue, for tow bar the filler will be required, for panel the panel hole drill will be required, the 28mm (I think) floor hole is easier than chain drilling like I did!
I leave it here for now