My answers:

Q: Currently you are using an individual engagement grant, what about the future when the grant has finished or spent? How you will fund your UG?
A: The UG does not need funding per se. As explained in the "Transforming words into action" section of the UG page, only some projects will require monetary support. When money is needed, grants can be used.

Q: I want to know if you are thinking in future. Are you thinking in a kind of organization for your UG like a proposal of Board, structure or membership requirements for WS UG?
A: Not yet. Personally, the UG will be primarily a means for discussion. Wikisource language communities should interact more.
If organization is needed, I propose the election of three or four leaders. If membership requirements are needed, I propose the following ones. "You can join the UG if you have made 15+ (fifteen or more) edits to Wikisource _and_ your first one dates back to 5+ (five or more) days ago."

Q: Until now Aubrey and Micru are the most active in the UG, what about the rest of supporters? Are they really involved? Are there real-life activities to involve them? Have any plan for a future face-to-face meeting?
A: You can find me online, though I could not currently take part in any real-life activity or meeting. Discussions are among my favorite activities. I'd sometimes like more radical decisions instead of having legacy around. "Don't be afraid of innovations" could/will be one of the UG's principles.

Erasmo