Change se alloys for spokes

I've a cast model bike too and my idea was to fit 17" laced wheel but not fat silly ones. I've just bought some older America wheels for the hubs (it's only an experiment) to refurb then stainless spokes into some new black tubeless lightweight rims. I'll be building them myself as it's easy so then it'll be on some nice rubber. Buying any other option for me would be far too expensive as everyone seems to want to fleece your wallet