Thats phenomenal! Myrtle is one lucky Uro!
I would like to echo the prior post that I would not feed very many crickets. In addition to the Uro being mainly herbivorous, especially as an adult, one would assume that myrtle is not the healthiest little beast that she could be. Digesting the crickets may tax her system even more. Once she gets the proper food in her, and a good UVB light (which stimulates eating) she will hopefully grow. It is possible though that her growth has been permanently stunted, though my adult mali grew until he was 6 or 7 years old.
So hopefully she has a few more inches in her!
As for the cage, I documented some of the steps I took to build mine - I had all the wood cut for me, so I basically just had to assemble it. I have never done carpentry before and it was really easy! I made the space from the floor to the lights 24 inches, particularly so that it could house my Egyptian later, but in retrospect I wish that I had kept it closer to 18 or 20 inches for the mali. The extra height makes it a lot harder to heat and get him enough UVB. Particularly since my mali will climb up things, and then instead of climbing down he will just dive nose first... so cage furniture to bring him up to the lights really is not a good idea (this seems to be something particular to him). I think both Archie (the mali) and I love the floor space of the 4x2 cage though. I bet myrtle wouldn't know what to do with all of it! lol.
Keep us posted - and let me know if I can be of any help!
Elizabeth

http://web.ics.purdue.edu/~echarris/archcage/
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1.0 Mali Uro Archimedes
0.0.1 Egyptian Uro Zuberi Mosca Khu (Mosca)
0.0 Fish
0.1 Sulcata Minnie
1.1 Iguanas Flik and Loki
0.1 Newfoundland Jasmine (RIP)
0.1 Feline Winter
Indiana & Wisconsin