I have mine built, and I'm just in process of finishing it. As you can see in my "before" picture there is very little counter space in my trailer. However once I add my cover; tonnes of space!
I will be the first to admit- I generally suck at wood working. Give me basic framing and I'm fine; but anything that needs to look good- forget it. So what I did is went to Lowes and got some pine shelving; and made sure it was already the right depth for what I needed. That meant only 1 cut needed with the table saw for the width.
For the base I got some of the premium pine (right next to the shelving; I think it is supposed to be moulding.) I used my mitre saw and made the cuts. Just so I didn't have to be precise with the 45 degree cuts I cut 1 piece, then cut the other to match. If one was a few millimetres too big I just shaved it down with the mitre saw. Repeat with the other sides. Used a finish nailer with staples so I only had to make one mark; and made said mark on the sides where it was less noticable. (All joints were also glued.)
The one part where I screwed up was attaching the base. I drilled my pilot holes and made sure my screws were the right length; but I should have used a clamp to hold the two pieces when I screwed.
I also used my electric sander to smooth all of the corners. Then I finished it with Tung oil.
The small bottle should be more than enough. The good thing about this oil; it's made for food surfaces as it's a natural product that doesn't spoil. The downside is it takes a couple of weeks to fully cure.
I know for some of you guys who do a lot of wood working this isn't a big deal; but I'm really happy with how it turned out.