Re: Uchi Deshi?
I headed to Iwama for training under Saito Sensei as uchi deshi after only three months of training in Aikido. (I did train at least five nights a week for those three months!) I stayed in Iwama for three months. Wouldn't trade the experience for the world.
Check with your dojo mates. They can suggest an uchi deshi program in your own style, and your sensei may be able to offer the necessary recommendation.
Best of luck. Training as uchi deshi is a wonderful experience. I hope you find what you are looking for.