Hey Neil,
 Google the racer supply houses.  There are through bulkhead fittings for
the lines...Mocal search..Pegasus Racing..those are a few that sell those AN
connectors, fittings, etc.  Also, check Fuel Safe(they sell fuel cells, etc)
And this place...B.A.T. (British American.....sumpthin) they have lot of
metric american cross over crap for fabing up fuel systems...I have about 3
buckets of various fittings left over from my race car..In that one, we
built an intake, Using TWM (another California fuel injection supplier on
the web) parts..8 individual throttle bodies...talk about plumbing!
  You should find what you need if you use some of those sources..Remember,
you will need to design something that won't spew fuel in case  the motor
gets "moved" somehow in relationship to the body...
  Don Hanson