You may also want to look deeper into the finishing that has to be done after the vacuum forming. I have visited places making items similar to those in your pictures and in many cases the vacuum formed parts went into a CNC router to trim the edges and take out holes. This was something that was difficult and un-economic to do by hand.

In addition some parts were done by the technique that pulls vacuum under the part and applies mild air pressure on the top. The equipment for this is a lot more complex.

I am a real fan for doing everything in-house buy you may be biting off a really big mouthful here doing it alone.