With regard to the clamping of stainless fuel hose.
If the hose is rubber with just a stainless braid covering then it is alright to use hose clamps.
If it is the Teflon inner hose then as you tighten up the clamp it causes the Teflon to extrude out from under the clamp.
If the fitting on the tank has a ridge to grip the hose, when you tighten the hose clamp the ridge will cut through the Teflon due to the amount of pressure the clamp exerts and the minute surface area of the ridge.
Even though it feels secure because of the stainless braid the Teflon hose will leak where it has been damaged by the clamp allowing either fumes or fuel to escape.
Dimi.
+1. Best to have a proper hose fitting installed at your local hydraulic shop - one that is compatible with the type of hose (and obviously fits the fitting on the tank). I have all kinds of hoses made up at my local hydraulic shop and they're not that expensive. Nicely made, appropriate for the type of hose and liquid being carried. We have very good hydraulic shops in Seattle here with all the aerospace influence.
Incidentally, regarding chassis flex, I bet any original GT40 chassis that hasn't been rebuilt over the years is about as stiff as a wet pasta noodle. Take a look inside the original sponson of a 40 year old GT40 and you'll see a lot of rust and diminished integrity. Moisture held between the bag and the pressed ribs and such is a killer, especially when there wasn't rust proofing as in the originals. Of course, most have been rebuilt over the years however.