Tony's web site has great technical downloads and a new section with real tech rehab tips
For 3D concept presentation software check out SketchUp. Free trial 8 hour download with tutorial video support. Regular purchase price a bit steep but well worth it if your into 3D.. This is some of the stuff that I have created.
How about underwater video of your water filled silo. Did some web surfing and came up with the following 3 outfits that market underwater video cameras. These units are used for search & rescue, exploring wrecks, bridge & dam inspection, plumbing & pipe inspection etc.