Early Ace fuel line routing

[aex125]

Does anyone know if there was a standard fuel line routing used on the early Aces? Currently I have the line routed along the main frame tubes but dipping below them when they encounter a cross tube. This means the fuel line dips lower than the frame rails which concerns me a bit as do not like the fuel line in an unprotected place. Also, should the line be rubber or was it a hard line?
   Thanks,
   Jay