I actually encourage builders to use different TCs. Different people see different things. As far as number of visits, I recommend first TC visit when you are ready to close up your first item. The TC should, at that time, should recommend when to call for next visit. As a DAR, I feel good when a builder has had 3 - 5 TC visits.
As far as compensation, we don't expect anything. We do this to share our knowledge and to make sure your aircraft is as good and as safe as you can make it.
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