it sounds like a nice set up, if your looking to dampen the noise, you can wrap your fan in padding, any thing that makes noise you can suspend using nylon ties, you can get real big ones,
so if things vibrate because of being on the floor you will want to try to put padding down on the floor.
making less noise is very important since right now you dont want others knowing. you can also take extreme measures by getting a bunch of empty egg cartons and put on the walls like a music studio has.
with all the pre cautions on the noise, remember it is just as important to make sure the air flow is good, the light(s), and your nutrients are proper and it sounds like you will be on track with what needs to be done,