I am renovating my garage and creating a home office. We have the dryer duct and hose water pipe going along the back wall. I plan on installing wall cabinets. My plan for the bottom is to frame out the area using general dimensions of a kitchen cabinet. I will leave the middle 6' on the front open for a 6x26" bookshelf. There is also a 9" high x 4" deep concrete ledge on the back wall.
Here is my plan to frame the top: box made of 2x4's standing on end with a double front plate.
Bottom: smaller box with double front plate
To this I will then attach vertical studs on the ends and the outside of where I will install the bookshelves. I will also attach vertical studs in the middle for support.
Finally, I will build a basic support for the dryer vent.
Topping this all off will be a kitchen countertop from Lowes.
How does my plan sound? How should I seal up the perimeter? Drywall first then build? Plywood?