I'd treat that pdf as a historical document as it relates to the original 2 point belts. You need at least a 3 point system as fitted to later PV's and Amazons. Your racing regs may require even more but perhaps you can get away with it in this "preservation" class or whatever they call it. Centre attachment at the tunnel should be easy but you will probably have to weld in a support plate at the bottom of the B post to support the seat belt reel. Check with other PV racers maybe?
Note that the top B post mount changed about 1960 from fixed to swivel I believe, so you might need to do a mod there too.
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