Why are you leaving a gap under the baskets? That’s not right your going to collect a lot of detritus under there bring it all the way down. What is the width of the of outer baskets? You have to provide enough width to put a basket in there to hold filtration ( carbon, biomedia, etc) the inner baskets 2 in should be widercas well that will be for heaters, Skimmer
If the LFS has that 45 empty you should look at it for ideas