Bozz,
Sorry for the delay in replying, under 95.55 Sect 1.2(e) the only inspection required is the builders pre-flight final inspection which is witnessed by an L-4 inspector. Note the inspector is only signing to say he witnessed the builder conduct the checks, the builder remains responsible for the airworthiness of the build. Having said that, its is hgihly recommended that a pre-covering inspection is done by an L-2 or higher to inspect worksmanship, fittings, construction etc. This is covered in the RAA Tech Manual Sect 3.3.1, also in a couple of docs I can PM you if you want (I scanned them but they are to big to post here).
Phil