Been making a snorkel .... well, practising making the bends in drainpipe !!!!
Lot of messing about at first, tried bending using a heat gun, easy to do but the bends crumpled and left bulges all over, inside and out. Then cutting and plastic welding, using a blowtorch! Not a good idea ... got some pics (if anyone's interested!) of the results and why I discounted them. Then decided to cut and glue .. haven't got 'proper' glue but as this is only a trial before I do the real thing I used gripfix .. nice blue colour so it shows up. Made a jig, cut my slots, bent the tube, glued it and held together with a strap.
So far so good, another installment shall be along when I do the real one and fit it ..
Took about an hour with all the faffing and getting the angles right, but it ought to be worth it. Thinking about using a bicycle inner tube 'sleeve' over the joins too, or self-amalgamating tape. I'm going to make a similar bend at the bottom so there's less flexible hose needed, then work out how to plumb into the 300 Tdi standard airbox. I have a spare airbox and inlet tube I can play with and a few ideas, so once it's done and I think it's strong enough and watertight (obviously) I might think about making a few kits up and see if they sell!!
Would anyone be interested? No idea of price yet, depends on how the airbox attachment works and what it needs, but I'd reckon under £100.