Consider the length of that aluminum tube (mocked up via your photos) and the strength required to hold the weight of the coolant and whatever hangs off the end. Looks like a lot of stress to me, unless you add some metal bracing along the way to support it.

Consider going the other way: fancy aluminum tubing off the body-mounted (I presume) EWP with the rubber hose bridging the last gap between tube and engine inlet, so that the engine vibrations are dampened close to the engine and avoid additional stress on the tubing. If you can have a bend in the hose, I think that would work better to dampen the vibrations. MB engineers etc. etc. etc....

__________________
Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC