tank is built and now doing the top , and since this is a project, i guess ill show my error i did ( was my bad ) , anyway the top has to be marked out 1 and half inch smaller for the tank and i measure wrong , mark the whole top part out and mark for my pre drill holes , mark out the whole top which is 8 feet long 4 feet wide , took me good 2 hours then befor i drilled , i double check my measurment and found i measure wrong,,, off 3/4 inch , had to drawl it all out again , so mad o well least found befor drill and cut , yep good times lol , it is what it is , the next pic show my bad ops lol