Where to buy custom acrylic ATO box

[CSJIII]

I just set up a 57 gallon tank and have a sump. I don't have much room in the stand to put a box to fill with RO water to use with my ATO. Is there anywhere online that make acrylic boxes in custom sizes? The space that I have left to put a box measures apron 4"x10"x14". It will be enough and will make it look as thought it's part of the sump. Any suggestions are appreciated!
Chas

 

[Eternal]

melevsreef makes them. https://www.reef2reef.com/forums/melevsreef/58681-custom-auto-top-off-container.html