i went over to my local home depot and bought some sheets of lexan but im in a quandry... i understand how im gunna do the basic 5 sides for the box but im unsure how exactly im gunna seal off the lid... any ideas on how i can do that? i want to have the top to where i can get inside the box if i need to mess with my plates or my connections... i could completely seal it but if something goes wrong then im screwed and have to bust it open

thoughts or ideas?