I've been digging around in MO's website and I think I've found the appropriate statues on the bumpers.
This is the reg on the inspection requirements:
11 CSR 50-2.311 Bumpers PURPOSE: This rule formulates procedures for the inspection of motor vehicle bumpers as required by section 307.172(2), RSMo.
This covers the actual reg's on bumpers:
307.172. Altering passenger motor vehicle by raising front or rear of vehicle prohibited, when — bumpers front and rear required, when, exemptions — violations not to pass inspection — penalty.
As I read this and as I understand the rules on kit cars, I am the manufacturer. According this, bumpers are only required if standard equipment provided by the manufacturer.
2. Every motor vehicle which is licensed in this state and operated upon the public streets or highways of this state shall be equipped with front and rear bumpers
if such vehicle was equipped with bumpers as standard equipment
The seat belts are a lost cause. 5 point harnesses don't meet the
NHTSA requirements which is required by MO law.
307.178. Seat belts required for passenger cars — passenger cars defined — exceptions — failure to comply, effect on evidence and damages — penalty — passengers in car exceeding number of seat belts not violation for failure to use
2. Each driver, except persons employed by the United States Postal Service while performing duties for that federal agency which require the operator to service postal boxes from their vehicles, or which require frequent entry into and exit from their vehicles, and front seat passenger of a passenger car manufactured after January 1, 1968, operated on a street or highway in this state, and persons less than eighteen years of age operating or riding in a truck, as defined in section 301.010, on a street or highway of this state shall wear a properly adjusted and fastened
safety belt that meets federal National Highway, Transportation and Safety Act requirements.
I'm continuing to research the catalytic converter regulations. To be continued...