Forgive me if this has been posted already, but I came across this really interesting kickstarter for a premade vacuum former. It's obviously too small for ramps, but I can see it being used to make smaller reproductions of things like the mountains on white water and such. It's projected cost is $350.
I thought it was neat, and would share it with you guys.
https://www.kickstarter.com/projects/1094489804/formbox-a-desktop-vacuum-former-that-makes-beautif
I don't know much about them, but a friend had a hobby vac former that he used for plastic model kits. Formbox seems a bit pricey, and small, compared to some of the others out there.
http://www.widgetworksunlimited.com/SearchResults.asp?Cat=35&Click=2&gclid=CPG06qbY3swCFQmqaQodrjAJaQ
There is this DIY as well
http://hackaday.com/2011/08/31/how-to-build-a-vacuum-form-table-that-gets-it-right-every-time/
You can definitely do this cheaper.
To heat your plastic, use a infrared heater. Most thermoplastics absorb it readily and heat up excellently. Another plus side is that IR heat only heats up things that absorb it.
You can make a nice reflector box that you set the plastic on top of, and it warms it up appropriately.
Here is my awesome drawing of it. 
I suggest this because it's way better than using your family's oven to heat thermoplastic, and also not constrained by the size of your oven.
Quoted from Wolfmarsh:You can definitely do this cheaper.
To heat your plastic, use a infrared heater. Most thermoplastics absorb it readily and heat up excellently. Another plus side is that IR heat only heats up things that absorb it.
You can make a nice reflector box that you set the plastic on top of, and it warms it up appropriately.
Here is my awesome drawing of it. I suggest this because it's way better than using your family's oven to heat thermoplastic, and also not constrained by the size of your oven.
Think what you describe is in the link I linked.
Quoted from sd_tom:Think what you describe is in the link I linked.
Good call! Sorry about that. sd_tom is correct. The video in his link is exactly what I'm talking about. This is probably the video I learned it from (from sd_tom's link):
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