Agreed. This is your tank, don't let other peoples opinion change your plans for the worst. If you're ok with it then skin it with some decorative plywood and call it a day. But like he said, once you fill it with water, it becomes very difficult to correct things.
I agree with the start over, of all the things this hobby is going to force you to buy, a couple more 2x4's are nothing. Nothing ever gets done with out a little practice. You get props for recognizing some flaws others point out and accept them as constructive to help you make yours better.
good luck