It might be worth giving stif cycles a call they have been good deals on boost forks at Steve peats and recently in the yard sale, see if you can get the frame and a fork deal thrown in..
If you are going hope headset the mix n match is £25 an end on winstanley , a fair bit cheaper than rivals
A rockshox yari fork 130mm is £349 on start fitness and been loads of 10% codes recently, could be an option
A Lovely looking bike I’m thinking this (or cotic soul or stif morf next) although after having my lefty powdercoated would it be sacrilege to get this bike done, and yes I guess void the warranty
Ps. @antares what weight would you say it is approximately please, I like a little cheeky sometimes and so farmers gates have put out my back in the past ..