so aluminum will oxidize, and will require frequent sanding.
There is someone in Australia that does this, but it's a much more arid climate than yours.
you won't find stainless steel strips in a big box store, you need a metal supply house, worth looking.
No, you won't be able to control gauge well enough by setting in concrete, you just take wood ties, and cut 2 slots in them and probably use glue.
You should REALLY read this thread, from a person who has tried a lot of things and learned a lot and succeeded.
For all new readers: I changed the topic title because: total wooden tracks are a JOKE, i learned a lot and this forum, and they give me the knowledge to make some decent tracks, read upon my mistakes to your advance and make your own tracks in your own capabilities/wallet. Good evening you...
www.gscalecentral.net
It's a long thread, but it takes time to learn what what works and what doesn't.
Greg