As you regular readers already know I'm thinking about getting/making some more racks to hold larger snakes. Would be easy if money was no object. Here's a summary so far of my research, hope it helps others. Also, always open to suggestions 
Bad news:
I found online some racks for CB900 tubs, 2 stacks of 10 would be $1450 shipped (not including heat tape or tubs). After adding heat tape and tubs came out to over $2150. Ouch, too expensive 
Found PVC sheets at local plastic house, again ouch - 3/8" was $120 for 4' x 8' sheet would need 8 sheets plus one more thinner sheet for backs or $1000 for materials to make rack, only $450 savings from buying online. Still have another request for quote out with another plastic supplier for larger sheet goods 5' x 10'.
Now for the good news:
With Jonel's help I found two different Iris tubs at a local store:
CB 39 - 33.375" x 17.625" x 5.25"
CB 110 - 38.5" x 19.75" x 6.125"
I'm now thinking about making two melamine racks, one for each size tub. 11 high for the CB39 and 10 high for the CB110. Both racks just over 6' tall. Each tub would have one panel of the 11" flexwatt. Total cost estimate - around $800 including tubs. Now we're talking!!
I keep two basic species, BRB's and BCI's, each have different heat requirements. I'm thinking the CB39's would be good for up to small adult BRB's and/or sub adult BCI's and the CB110's would be good for large adult BRB's and small adult BCI's.
If I ran two thermostats and individual cords to each tubs heat panel I can configure the stacks to hold both BRB's and BCI's in the same stack and be able to switch individual tubs back and forth between thermostats as needs change.
Any thoughts / ideas / harpoons ???? Be kind 
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Thanks,
Dave "Rainbows-R-Us"
0.1 Wife (WC)
0.2 kids (CBB)
4.12 Brazilian Rainbow Boa
2.1 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 


