There are still a few places that do engineering prints (and posters and wall art and such), so if you can get the blueprints you want as PDFs (or other graphics file formats), you can have them plotted at any size you like (making a better fit in the room, with a little planning), within the limits of their plotter's roll feed.
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A while back, I was working on marine exhaust risers, which normally bolt to a Diesel engine, and we wanted a way to show off the product, nicely polished. ... and working. I had a carpenter make a roughly engine- shaped box, to which I glued full size blue on white prints of an actual engine, with the trade dress removed because I couldn't get permission from the engine mfgr. to show off his stuff. Some of the fine lines on the original print blew up to 1/4", so the print shop called about that, and I said that's what I wanted. The finished box looked pretty nice (I wish I had a photo), with the blue lines clearly suggesting an engine from tens of feet away, but not detracting from the shiny riser.
I also had the print shop laminate the prints on both sides, which added a little snap to the display, made the images more durable and smudge-resistant, and I think made them easier to cut, fit, trim, and apply over 3M spray contact cement.
Inside the box, I installed a high pressure blower and a water pump, so the business end of the riser could be seen in action. I fitted acrylic tubing downstream of that, where there would normally be stainless or fiberglass, and looped that around to the back of the display where a marine muffler discharged the air and separated the water, which drained into a concealed sump for re-use.
The box was pretty heavy to lug into a show, but a lot lighter than an actual engine, and it seemed to draw people near, which was the whole point.
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Mike Halloran
Pembroke Pines, FL, USA
