Need help: WA metal conversion

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I've got a WA .45 speedcomp 2 and I'm thinking of adding a metal slide and a guarder barsto outer barrel. Anyone know what slides are compatible with this gun?

This is more or less what I would like to do:

http://www.lumbo.fobhawaii.com/speedcomps.html

I would like to put a limcat, STI or springfield armoury slide on it. Is slapping a metal slide on it as simple as it seems? I've searched some treads and it seems that some slides require more work than others... Also, are TM Hi-capa parts compatible with WA guns?

any info would be appriciated,

thanks