Thanks Cristonamo! I used 1/16 fun foam to cover the interior, moulds to surfaces nicely, just hot glue in place. 3/4" plastic corrugated tubing, some stainless tubing, speaker wire. The tubing connects to a brass 3/4" threaded nipple to which I glued a tap aerator onto the end. I covered that in fun foam and added a clamp. I have the battery packs at the rear that power the 2 fans...a nice tip I picked up here on these forums .
Thanks Sly11! I'll certainly look at getting new mic tips and S trim, cheers!