Welcome to forums Mr Grant.
dirtpusher9, his 1st name is Joe, a very kind & helpful person, but also as of late very busy with his job. Don't see him quite so freqently anymore. You can send him a PM (personal message), which he'll see right away the next time he logs in. And if you don't know how to do that, then look near the top of the forum page for the hyper link to FAQ, that'll explain how to send private messages, as well how to use many other forum features in detail.
I think one of the other guys you refered to with 1/6 gas dozer as seen on youtube before? He's a member here & his handle is dozer nerd (I don't know his 1st name), I believe he's from Washington state.
Another fellow, a very skilled craftsman that has built many models, few of them of rc, but experienced in working with many different types of materials is Jerry Hall. He spends most of his time in the Non Rc Model Trucks and Equipment forum near the bottom of the Index page.
And ofcourse, not to forget D8R, Dan from Sweden, he swears he'll finnish his 1:5.6 Cat dozer this coming winter. Beautiful machine! Here's the link to his thread
http://www.rctruckandconstruction.co...read.php?t=456
We look forward to seeing your progess on your newfound interest of rc constr equip.