That's a fantastic picture in opening post, it looks right at home there.
As for swapping over from rhd to lhd, maybe the parts from an Anglia would fit....they are similar size vehicles and I guess the gasser boys toss that stuff when they build a racer.The Anglias/ Populars, were virtually unchanged from the thirties to the fifties.
Nick, Sweden used to be RHD back in those days....the y was built in France ,Germany and Spain as well as Dagenham.....you LHD parts are probably from one of those Id say.Id love to see pictures of your roadster version as Ive never heard of one off those before.There was a sedan converted into a Pheaton over here a few years ago that looked quite good.
Here is a place that has spares for the little Fords.
http://www.smallfordspares.co.uk