Board for NEC LD-8035E VFD Tube
I was recently in Tokyo and picked up a clock kit using these tubes. The instruction manual &amp; schematics are available on this page, about 75% of the way down. The design uses a UPD848C clock driver chip. 

Your circuit looks fine to me, but if you look at the clock schematic note they have put configurable resistors on the filament of each tube - perhaps to match the brightness of the tube. Good luck!