Since size isn't an issue as compared to something wearable, I think doubling everything should work.
Another option is to use the same pattern but double the thickness of the yarn and enlarge the needle size.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry