Of those items only the rear axle tube replacement sounds like a machine-shop job, and most ordinary ride-ons need to be re-wired after the previous tenant has had his way with them. There is a full wiring diagram, and an Illustrated Parts List, in the rather impressive on-line owner manual. However you might find that the hydrostatic drive is worn, and a rebuild kit, if available, might be expensive. There's no telling what other parts would turn out to be worn or rusted badly.
You didn't mention it having the 3 point linkage. To me, that was the most impressive feature of the thing. Most of the fun you can have with a tractor involves the linkage, and having one on a ride-on mower implies that it was capable of pulling ground-engaging implements such as a plough, or handling a small scraper or grader blade, even a little front-loader bucket perhaps if the front end was strong enough.
Here's a picture of the linkage, from the manual:
![[Linked Image]](https://www.outdoorking-forum.com.au/forum/uploads/usergals/2013/12/full-2772-13449-mtd_143_990_3_point_linkage.png)