Check your flasher relay, under the steering column, pull apart and check the contacts if it is the old type or check solder joints with magnifyinglass on new.
also check indicator stalk switching with voltmeter for curant drop.
I am aware of about 9 cars being built and a lot of interest, rules are not finalised yet, testing is still taking place, Sounds like it will be fun, I am building an M20 and i know of at least one other 318 so there will be agood mix.