Dale Earnhardt Jr.'s treehouse is almost done ... and it's awesome

Dale Earnhardt Jr. is putting the finishing touches on his amazing treehouse. 

Earnhardt began the project last year - inspired by Animal Planet's "Treehouse Masters" - and purchased the building plan for about $100. On Monday, he gave Twitter followers a sneak peek at the almost-finished abode.

And what treehouse would be complete without an iconic photo of Farrah Fawcett?

Earnhardt's dog Gus seems to love it, too. Check it out.