The tank looks great!  The only similar things I can think of are the bottles included in some of the racing crew sets, like Tamiya's, and if they don't work, you really do have to scratch your own.

Seeing more shots of those hoses, I really like the way they look!

And I had to chuckle, I had quite forgotten about Al.  I took the opportunity to go back and re-read your Grosser Hund thread.  Your work is really excellent!

And with a couple of years looking at 1/20 figures on eBay, I think Al is one of the racers, isn't he?  I don't follow Formula One or other professional racing enough to recognize the portrait figures by name, but he looks familiar to me from the ones I see on eBay.  I have always thought they'd make good Strahl pilot figures, with very little modification.