Quickie Q2 Lite, Construction Manual, Page: 231 / 299

..... At BL00, a common attachment is used. The plywood should be about
2.4" x 1.5" and is beveled to form an A-frame arrangement, so that the
aluminum extrusion can again pull off at about 45 degrees. The 7 BID is
again laminated in place with the 0.75" MIN overlap onto the fuselage.
Next, in order to close out the front and rear parts of the 'tent',
carve some urethane for two 'plugs', one on either end; these are
installed after the extrusion is permanently mounted so that the AN525-
416R14 screws do not need to be accessed. The plywood was made long so
that even with the extrusion in place, there will still be room to
laminate 3 BID around the plugs up onto the previous 7 BID lamination
with a minimum overlap. Finally, install the seatbelts themselves. The
extrusion length for both inboard and outboard pieces is a nominal 1.3".
When finished, this BLOO mount should be closed in, rounded, and have
glass lapping onto the fuselage inside skin in the four directions.
..... Now is a good time to install the shoulder harness assemblies
permanently to their attachments. Since each occupant has a Y-harness
arrangement from one bolt, there will need to be two slots per side
placed in the seatback bulkhead to allow the actual harness to come
through into the cockpit. Sit in the cockpit to determine best where
these slots should be; they should be no larger than necessary, and
should have a glass-to-glass bond lamination around the slots.