A rack is the most efficient use of space and provides heat to each tub.



some quick thoughts:



As you found, wide can sag. Either provide center support or make two narrower units.



If you can't make rack to tight tollerances, use tubs with lids that latch. Sterilite has some that latch at both ends.



Route a recess for the heat tape.



Build it upside-down using actual tubs for spacers. Don't forget to add a little spaceso they slide in and out. Something like the back of a spiral bound notebook?

By building upside-down, you can make the sides longer than yoou calculate and then trim off extra or leave it for feet. If keeping extra height, don't forget to support bottom shelf





Don't know your finances but you could buy racks? Jeff Ronne at Boaphile has some nice ones, I have three of his 30 slot ones, very nice.
-----
Thanks,



Dave "Rainbows-R-Us"





0.1 Wife (WC)

0.2 kids (CBB)

4.12 Brazilian Rainbow Boa

1.0 Hypomelanistic BRB

0.1 Het for Hypomelanistic BRB

0.1 BCI "Elvira" normal from 1989

1.0 BCI albino / het-anery

0.1 BCI Hypo / het-albino

0.1 BCI Anery / het-albino

0.1 BCI Hypo (possible super)

1.0 BCI albino het stripe

1.0 BCI salmon hypo

0.1 BCI ghost



lots.lots.lots feeder mice and rats

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