WRONG MEASUREMENTS! A 125 gallon is 72"x18.5"x21"...Please read this before you buy the materials at 5 feet long!....umm as for building it...sure you can go build you a stand but if the price is anywhere close to $250 just buy it...I just purchased my stand offline for $16 shipping and handling from this aquarium/fish selling website...Let me know if your interested in the link...for aquariums under 200 gallons id say just go ahead and buy the stand straight up instead of waisting your time...unless you want something totally off the ricter