Hatchling Trough

So my Axolotls have gifted me with almost 600 eggs this go round and my old system of plastic shoe box tubs for growout isnt up to this task.

I have limited floor space (2 bedroom apartment with multiple tanks, a significant other, and stuff), so my current solution is to mount a trough over my 125 gallon axolotl tank and tie it into that system for easy water changes.

So my question is:

Short of me scratchbuilding an acrylic tank just for this (which is a possibility, but i'm a bit overworked and overloaded with my recent move to this apartment), what prebuilt options are out there? Its got to fit inside of a 72x18 footprint. only needs to be about 5" deep. I have about a week and a half to complete this before the little buggers start hatching out.

Thanks for the thoughts everyone. I've decided to go with vinyl rain gutters. Currently working on the plumbing/stand. Its all going to mount over my 125 gallon Axolotl tank and tie in to the existing system for filtration.

Working as fast as a full work schedule and moving will let me.