I just ordered my kit and will be building a Mosquito XE285 helicopter. I hadn't planned to add a transponder or ADS-B Out at all, but I may reconsider if I can do it simply and relatively inexpensively (easier to add during build than retrofit, I think). My head is about to explode with all the searching I've done, and most ADS-B solutions all seem to focus on existing setups where the aircraft is already equipped with a Mode C transponder. So:

1. Do I need a transponder if I have an ADS-B Out system? Can't I just be compliant with a UAT?

2. If the answer to#1 is NO, any suggestions for some 'simple' installs in a new build
a) assuming I also want ADS-B In
b) assuming I will not have ADS-B In (does this make it easier/cheaper?)

3. Anybody already gone down this road yet? I'll be going to Sun 'n Fun next month to do some shopping.

Thanks, Dick

PS - the only reason I'm even considering this, is that I am near enough to a Mode C Veil where it would be nice to have the capability without having to call ATC one hour prior.