You can buy all the hardware screws, nuts bolts etc in stainless steel at home depot or stores like it. they are in the bulk section just read the box lables. I have not been able to find stainless screw eyes so I bought some at a pet store recently. the homemade stand are very easy and inexpensive to make.
I used this one as a guide and built my own:
http://www.cheepparrottoysntips.com/playgyms5.htmlremember....YOU are a rocket scientist.....YOU can do this!!!
I bought some trays at IKEA and bolted them to a base and then built up following the idea above.I wrapped cotton rope around the pipes, after sanding them just to make it easier to climb....
Plus I used a large 3" end cap and screwed in down with stainless nut and bolt for a treat cup.....
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