Looks great. Just the later HR bonnet required now to finish the transformation. Don't forget you can offset some or the cost by selling the old components.
Maybe go with the K&N aftermarket cone filter and fully duct the filter with the biggest diameter pipe you can fit in the bay. Plenums are good too. Plenty of traders to help on here
Tall order on the seats I think, but best of luck in finding some, and the other parts. Check with Zmanalex. Also check the ones being broke on fleabay as well.
Wow that's what you call a house, with a view to die for. Have travelled by ferry to France, driven through Switzerland and out into Austria. Fantastic views, kept stopping for photography. Certainly an experience to enjoy.