Hey Paul,
Congratsz on pulling the trigger and live in the garage. You are going to have a fun time working your way back in.
Your questions: The easy one first.
The leonov will work. I have run my gsender (and thus my machine) on an old I3 win10 pc I bought in a second hand store for 15 bucks. It managed but I replaced it with an I5 for a bit more “good feeling“
The I5 is a DEL one and works perty stable with only minor hickups that might not even be its fault. (I run an old version of Gsender and it has its quirks.) I have run Gsender on my I7 in the office and have the machine work while I was designing fom that pc via a 10m long usb cable. Due to usb problems I decided to mount a pc at the machine, but the trouble I had with the setup turned out to be the USB cable that came with my machine and was still in between the long high end cable and the controller.
So.. I can say that, yes, you can use your altmill pc for other things while milling.. however… I don’t know if you can get it to run two sender programs sending data to two different machines. You might run into some trouble there, so that is a test you want to do yourself (and get back to us posting results because that is an interesting experiment.)
The table on wheels? Yes, absolutely yes. I mounted my machine on a pivot table and needed it prety much right at the start.
On the bits. I have (mis)used a lot of bits. Started out with some starter stuff from sienci, found a cheap retailer selling essential aliexpress bits and won a few bits via sienci contests. All work well and all will dull. What is better is something to find out by comparing them yourself. Going with the amazon option at first is, in my humble opinion, the best route to take. I believe no one will start a war on that opinion.
Now on the topic of working your way back into the house, for that isn’t a goal you should think lightl;y about. It is going to be essential that the misses is going to be your first priority when it comes to doing projests after you gained some comfidence breaking stuff. -you will break stuff-
The moment I stopped breaking endmills and burning my fuses, the misses got her chicken pen. It wasn’t the ideal project for a cnc and I had to lock down my mitersaw to force myself using the mill but., the result got me out of the garage instantly. (could not have done that without the machine being able to pivot)
After the first welcome back, keep surprising her. Please note that reminders are the most powerful tool you have at yur disposal to.. remind… stuff. Make sure she does not forget what the cnc brings her.
I have made this cute addition (engraving in the small door near the ceiling) to our century old house and had her discover it herself. Can’t do that without a cnc, dear.