re: lift struts
been there done that. the exact size streamline tubing is not available for the wider ones from anywhere. so you cant make a copy and get a form 1.
very similar tubing is stock from spruce and could be used, together with lugs from an engineering company. but then its either a re-certification issue with the caa or a more basic excersice with the pfa.
Although how any of the above would be seen by the current 'design / copywright company' last known to be steven sywell (who technically bought the assets of auster and beagle / auster products from Shoreham in the early eighties as far as i know. is another question. but so is how much insurance would cost if a new DA is set up to keep them on a CofA.