BUT SketchyPhysics is it Why not post about your problem in the dedicated SP subforum here, as I am sure there are ways of animating just 23 objects in SP - think of the exploding or falling block animations...

you can also try OpenSpace3D (free) Just export your SKP file and have happy walk

@chriswman said: Thanx for the reply but sketchup crashes everytime I try to "play". Does anyone else have a problem with that model crashing? It seems to work OK on my PC. To ChrisWMan: Is it just my model crashing or are you generally having a problem with SP crashing? I have attached a new file with examples of joining hinges and sliders. In this one I have not directly connected the hinge to the slider in case that is what is causing your crashing problem. Let me know if this one works. The small white connecting blocks can be made invisible if required. IndirectJoints.skp