I spent about 4 months designing and redesigning my 300 gallon. I spent about 4 hours picking out and building my car online. Input the price I wanted to pay, went to the dealership, haggled for about 20 minutes and was done.
Sump took the most research and designing by far, but I knew exactly what I wanted and put in the time to get it that way. The beauty though is when you build a tank from scratch and have to wait for it to be built and delivered, all you have is time....