I'm fine with mechanical, but you can get a fully mechanical built on needle threader, and I love my knee lift with is also fully mechanical (many are electronic) However I don't know if you can get a fully mechanical built in thread cutter - all I've seen are motor actuated, not lever actuated.
Does your machine have cams or step motors for the design stitches? If its got step motors then it's not mechanical for them. Now days, there are a lot of new machines that are marketed as being mechanical, when they are quite for from it, they just aren't computerized. If you can use the features without having to to plug the machine in, then it's fully mechanical.