It might not be the easiest project in this list, but if you already have some experience with wood cutting and joinery, it won’t be any hassle at all. Thanks to the extremely detailed instructions it shouldn’t really be a problem even if you’re not very familiar with woodworking. This could actually be a great project for refining your woodworking skills as a beginner!
1. You mention doing other hobbies which I assume means stuff scattered around for various projects. (Don't tell me you do one at a time or are a neat freak!!!) How tall are the side walls to the shed? How high do you shuffle stuff around, i.e. flipping things over, moving wood around, etc? I can't imagine trying to do that in my shed, even if it were 2 ft higher than it's 7 ft center height. If you could build a platform in front it may help, especially if you can put removable cover over it (to please HOA).
@cahudson42 I bored the holes in my sandwich top with a 3/4" power auger bit with the drill in a portable drill guide that kept it vertical and in a way a bit like a plunge router. The guide screw of the auger was dead easy to centre over the laid out grid points. The holes are dead straight and clean sided. The auger bit was new which probably helped. As stated I have three rows from an end vise running the length of the front as well as from the front vise and holes in the front apron to support long pieces as well.
The next day, cut it flush. Use a block plane to ensure it truly is flush. This will be the top of the bottom layer of the bench top, so gouges aren't a problem. (Wiping up glue with a damp cloth can lead to stains and finishes applying unevenly. That won't be a problem here, either.) But bulges and bumps are a problem - they will keep the two layers of the top from matching up evenly.
As soon as I came across this tutorial, I didn’t wait any longer to start building one. Some of the items you need for this project are hardwood plywood, saw, glue, nails, drilling machine, etc. The video is very easy to follow for anyone with basic woodworking knowledge and experience. The first source link also includes a step by step procedure in plain English for those, who are not comfortable enough with the video tutorial.
I ended up making a number of practice cuts. The first revealed that I hadn't tightened the screws on the edge guide enough. The second revealed that the design of the edge guide provided very little support at the end of a board, because of the cut-out for the router bit. In the "Getting Started in Woodworking" video, they had screwed a piece of hardwood to the edge-guide, to provide a continuous -- and longer -- bearing surface. I may do that myself, some day, but I didn't have the materials at hand, so I clamped some 2x4 scrap to the end of each board, to provide a continuous bearing surface past the ends. The two grooves in the long stretchers and the side groove in the short stretchers have identical layout. I made practice cuts in scrap until I had the edge guide set correctly, then I cut them all with that one setting. The bottom groove of the short stretchers uses a different setup, so it was back to the scrap, before cutting them.

A steam box and a heat source are the two main components used to steam bend wood. Steam boxes must be able to withstand large fluctuations in temperature and humidity without breaking apart. In this two-hour workshop, students will build an optimized steam box that can last through the tough job of steaming wood, allowing them to continue creating their own projects at home!
Of course, I, on the other hand, with my Ikea oak countertop, probable went overboard in the other direction. Since I needed to trim the countertop to width,I figured I'd take off a couple of 1/2" strips to use for edging the MDF. I clamped the countertop to my bench base, and used the long cutting guide. I'd asked around for advice on cutting this large a piece of oak, and was told to try a Freud Diablo 40-tooth blade in my circular saw. I found one at my local home center, at a reasonable price, and it worked very well.

Anyway, I'd like to know if I'll be able to keep (EDIT: and use) all my tools out there (current and planned) without having the shed become a rust-bucket for the tools and machinery inside. I'll have a 10" contractor's saw out there along with a drill press, a sanding belt, a router & router table, and lots and lots of old tools that I inherited from my Granddad years ago. I live in the Seattle area, so it rains A LOT. But I'm hoping that with the proper ventilation I can keep the tools in the shed dry.