I was hoping to buy an artifact but the...
I was hoping to buy an artifact but the waists are too thin for my gangly feet... Is it possible to order a wider board some how?
Not available. The Rome Machine is very similar, has the same core, it's a wide board which will accomdate size 11+ feet. http://www.dogfunk.com/snowboard/Rome-Machine-Snowboard-Wide/ROM0012M.html
I personally ride the Rome Machine 154w and I love it. I have strapped on the Artifact just to press it out to see the flex and its just a little softer than the Machine. You could also try the Postermania in wide aswell, but its a reverse camber. But just like Daku said, the Machine will do you just right