I have read FAA regs for what repairs/mods require a new airworthiness inspection. I am not clear if my modifications require a DAR inspection for new airworthiness or is an A&P/IA inspection enough? I have a Wagabond Traveler that I modified as follows:
1. Engine Accessory mods: New STC starter and alternator. (I assume this does not constitute engine mod for airworthiness)
2. Landing Gear Mod: Replaced original builder-mod spring steel gear with Grove aluminum gear (Repaired fuselage tube damage and installed pads on lower longerons by welding)
3. Replaced 30% of fuselage fabric after removing for inspection.

Do any of these changes void the original airworthiness so long as done per FAA AC standards and have A&P sign offs?