Ginger beers? Heck ya! I made them as a homebrewer, and in my soon-to-happen brewpub gig, I'm planning on giving a crack at one as a seasonal at some point. Ginger can easily overwhelm an ale, and make it not so tasty, better to err on the side of caution; my dream is to make the alcoholic equivalent of Reed's Extra Ginger Ale.
There's numerous homebrew scale recipes for Ginger Beers/Ales; I'd suggest if you can, do a small batch to play with the flavors, then scale it up. Remember that sometimes a linear scale-up will not get you what you want, just ask me about my cranberry porter :P
Rob "Ask me about my brewing tattoo" Zamites
"By man's sweat and God's love, beer came into the world" -- St. Arnold of Metz