Beautiful place Austin.
I am a graduate of UT and back in the day did a lot of sailing on Lake Travis. Was a member
of the Austin Yacht Club and they have continued to improve the club so you may want to check their bylaws and see if you could live on your boat there. I have known Yacht Clubs that will look the other way when members "spend a lot of time on their boats".
Just be aware that living on Lake Travis and working in Austin proper may necessitate a lot of driving in a tremendous amount of traffic. Ironically the traffic I was in there a few months ago reminded me of the nightmares of when I use to work in Manhattan.
If the traffic doesn't scare you then I am sure you will love your environment
whatever marina you choose.
Wishing you good luck and times.