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I have been searching for paperhammer templates, mainly titan size mechanical legs, and haven't found much of anything. Anyone know of any good sites?

Papercraftsquare is in general a good source - but several of Patorochs templates linked there are not available any more.
I can’t say whether there are as well titans... I THINK I have seen at least warhounds there... or somewhere.

Welcome among the noble ranks of 40k papercrafters.
If you put some effort in it, it can get at least as good as an original.
No titans, but 95% paper:
https://www.dakkadakka.com/dakkaforum/posts/list/758766.page

I have found some good models here - this is the latest page, but have a look through, i think there were some people working on titans

http://www.papermodelers.com/forum/alternate-dimensions/9966-whole-bunch-o-40k-goodness-90.html