It's a shame about the chain and self right, but at least the rest of the build looks great.
For the LinAc, I have been using a free trial program called Mechanical Expressions. It's 2D, and the modelling is done with simple nodes, lines and coordinates. Add a load of 13.6kg, and it'll tell you the force on the LINAC.

If you decide to give it a try and struggle, I can try and lend a hand.