Quickie Q2 Lite Construction Manual - page 269
HEADER TANK CONSTRUCTION
.....
Previously, in Chapter 14, you have installed the main fuel
tank permanently in the fuselage, along with the main fuel tank fuel
gauge.
.....
The important fuel header tank dimensions are shown in the
accompanying drawings. This fuel header tank is installed against the
upper fuselage inside skin approximately 5 inches aft of the
firewall. Sufficient room must be left so that the pilot's and
passenger's feet will clear the header tank.
.....
The large sump is a simple rectangular box. The upper portion of
the header tank is curved to fit within the fuselage. This section
must be custom fitted to each individual aircraft. Suggested heights
for the front and rear pieces are provided as a guide. The length of
12 inches should provide sufficient clearance for the instrument
panel radios and instruments. However, this header tank should be
adapted to your particular aircraft, verifying that both the pilot
and passenger can be comfortably seated.
.....
All pieces for the header tank should be cut from the 1/4" thick