The wood pieces will come right out.
You will not be able to screw the tabletop to the base and force it to be level, even if you use L brackets.
I see the top can come off but can the base be broken down more so that it can be put into a station wagon? I added some pictures to the end of the post to see exactly the products I used.
If you like this post, check out my There are tons of similar designs that you can find all over the internet — — and in the trendy shops like Restoration Hardware.
Are you concerned about your top splitting over time? The way to keep issues of wood contracting or expanding from happening is to keep the relative humidity consistent in the environment where your table is.
I love your ratchet strap idea to substitute without the clamps.