If you want your table top -- any table top -- to actually ast without bowing/cupping/twisting, you MUST attach it in a manner that allows for seasonal wood movement. Wood is an organic product, and it naturally expands and contracts with changes in temperature and humidity. I'll post link below to a couple of options that you can cheaply buy which will allow you to securely attach a tabletop while still giving the wood the flexibility to move with the seasons. When you buy decently-made furniture at a store, they all accommodate for this one way or another. Don't just screw the top down to the legs or the skirt...you'll regret it later on.
Clamp curved caul edges inwards so they align tabletop boards in the middle, then torque up the main clamps to draw the boards together. If the width of boards you’re using allow it, pre-glue boards for your tabletop in sections that are just narrow enough to fit within your thickness planer. Run these through the planer to clean and level the glue joints, then move back to clamps for final glue up. Working in stages like this reduces the number of glue joints you need to sand smooth and level later.
It's important to sketch out a plan in advance so you don't have to take a sudden trip to the store. Sometimes, no matter how much you plan, you still end up needing a part. A lot of craftspeople keep a basic stock of supplies on hand just in case. Also, as you get more experienced at crafting, you gain a better understanding of what you need for a project.
The space behind a door is a storage spot that’s often overlooked. Build a set of shallow shelves and mount it to the wall behind your laundry room door. The materials are inexpensive. Measure the distance between the door hinge and the wall and subtract an inch. This is the maximum depth of the shelves. We used 1x4s for the sides, top and shelves. Screw the sides to the top. Then screw three 1×2 hanging strips to the sides: one top and bottom and one centered. Nail metal shelf standards to the sides. Complete the shelves by nailing a 1×2 trim piece to the sides and top. The 1×2 dresses up the shelf unit and keeps the shelves from falling off the shelf clips.