Don't know where you're from but there must be a place there to pick up a few clamps and do it the best way to show off the excellent job you've done so far. You can never have too many clamps.
Looks to me you are in the garage, making sure all is square and such, glue it all up and, keeping things square, park your car on it!!---just kidding, but get a couple heavy boxes you can put on it. Just keep the ends perpendicular to the rest and it should end up square. If you try it and it doesn't work just tell folks some idiot on the form is to blame!! BTW I want to say your work up to this point is very well done, preserve it!!
Wisdom: Where experience and knowledge combine and become one.
"We are all one decision away from Stupid!!"
"How often we sacrifice the permanent plans of God on the altar of immediate solutions"
I have a very good memory, just short is all.