We require this, within an easy read of the passengers. Not an explanation of the aircraft type. Not that that is the best thing. A briefing of the safety items is a standard. Most people want to go up because it is a home built. They know it is extremely well cared for.
Placards
(27) Unless otherwise required in the applicable section, each amateur-built aircraft shall display the following placard:
one containing the following statement readily legible from each passenger station, or displayed on the side of the fuselage:
YOU FLY IN THIS AIRCRAFT AT YOUR OWN RISK.
THIS AIRCRAFT DOES NOT COMPLY WITH INTERNATIONALLY
RECOGNIZED STANDARDS.
if the placard required by 27(a) is displayed on the side of the fuselage, it shall be in a position that is readily legible to persons entering the aircraft, in letters at least 10 mm (3/8 in.) high and of a color contrasting with the background;
in any area of an aircraft designated for the carriage of passengers, other than an area beside the pilot, a placard showing the maximum permissible load for that compartment or area:
MAXIMUM PASSENGER AND/OR BAGGAGE LOAD: ..............KG (LB)
Maybe it is best to explain to the nervous first flighters that it not a factory built plane as your regs require. If they decide that now they really do not want to go, so be it. I find they have a much better understanding of the plane while taxing/flying than sitting in this "thing" that this "stranger" built to take them up "there" for the first time. Some are so overwhelmed to begin with before the prop even starts turning. Others want to know everything about it before we even get buckled.