Those vents do look convincing Rick, and at least they are on the underside where any irregularities will not be obvious. The "rough" coloration on the original was probably rough because it was applied in a hurry by a ground-crewman in a hurry who had been allocated the job and wanted to finish it quickly so that he could have a beer and go to bed! I sometimes think that we modellers forget how rough and ready some aircraft markings were: a close study of photographs sometimes reveals that finishes were a bit "rough" if they had been applied in the field. For me at least, "rough" means realistic, but I am aware that (as usual) I am in a minority!
Stephen.