I'd say the possibility of recreating smallpox from custom oligos hinges on this: Is RNA polymerase one of the proteins that smallpox requires from its own gene

I'd say the possibility of recreating smallpox from custom oligos hinges on this: Is RNA polymerase one of the proteins that smallpox requires from its own genes, or would someone be able to use stock bacterial polymerases to recreate its full suite of proteins?