Not a problem at all, please do. The closest one is 4x6 and then 4x8, 4x8. The skinny one in the back was 2x8. I made the frames and then got them level and then built them down into the ground.
I used cedar wood and deck screws that wouldn't rust and contaminate the soil. I added compost from a local place and never used any home depot plant food because they got it from the soil. Each box had it's own sprinkler line that I ran for 1-2 minutes 3 times a day.