These kits are very cool and would be great for a 40K Space Marines army.
These are some really cool kits and something you see ambitious modelers often doing. These are in scale to how a Space Marine should look compared to a regular human. That is, unless that human is a WWF juiced out super man from Catachan!
Check out their site for more pics.
http://chapterhousestudios.com/index.php?route=product/product&product_id=204