That is actually a very good question.  From a functionality standpoint, we need to remember a couple of things.  First, your booth is basically a big 'ol vacuum cleaner.  It's going to draw anything in the air in through the doors (unless of course you have filtered doors).  The oven should be well insulated so the heat shouldn't be a problem.  I will tell you to be careful about powder in the air near your fans on your oven.  It can (and will) draw in, melt, and create issues.

  The only other thing to consider (besides work flow, of course) is local code.  Most OSHA and/or Fire Marshall codes require 3 feet clear around all equipment.  Canadian CSA code is different in most all areas so that needs to be checked with the local CSA agent before assembly begins.

  Hope that helped!