Trays for food dehydrators on the cheap...

I live in the Pacific Northwest now and am getting near the harvest time here.  I don't have access to land now to grow much of any veggies or fruits, so I want to take advantage of some not-so-close organic farms that will be selling in bulk.  I will be canning some produce - first time ever.  I have also been looking at plans for a diy solar powered dehydrator.  There are some great ideas out there - including the one listed on this site ;)   I am looking for ideas to make trays on the cheap.  I need them to be:
a. easy to clean and keep sanitary.  My first attempt will only be fruits and vegetables.  I have a dehydrator that I purchased that I will use to do meat and fish.
b. not leaching any kinds of toxins (materials or paint)
c. reusable - I want to learn the "art" of dehydrating foods and continue to use it over the years.  
d. cheap - the cabinet will have a 1.6m height (lots of the same produce at one time) so I am looking at 20+ trays.  

Anything with liquids will be dehydrated in the dehydrator that I purchased.  

Repurposing materials would be a wonderful bonus.  

One of the other Boots and I set out some rhubarb in a dehydrator of ours just yesterday. Here's a photo of the trays:



In summary:
- 1"x1" wood frames, cut to appropriate length
- stainless steel window screening
- hardware staples, roofing nails, etc. for fasteners

At least finding the wood and fasteners can be easy for you, in terms of reusable/reclaimed materials.

Best of success to you on this...!