Planewave

Yes, that is not a problem. You can simply purchase a standard Network Cable (minimum CAT 6) in e.g. 10 meter length

When you (or anyone else) removed the previous 1 1/4" eyepiece clamp mounted on top of the prism housing, most likely at that occasion the extension adapter from the female 36.4 ("Vixen") thread onto the male T-2 thread inadvertedly got unthreaded as well.

So either you would find that ring at the bottom of the eyepiece clamp that was attached onto the prism housing before, or someone else had removed a previous clamp and did not notice that this "thread-adapter" got removed as well.

You might contact your dealer - or buy that ring separately: https://www.baader-planetarium.com/en/baader-adapter-m36.4--t-2-(t-2-part-03).html

Sorry, we don't know this spotting scope so we can't answer for certain. Focus to infinity should work with the included Spotting Scope Adapter from the Hyperion Zoom. You would have to check the threads of the Spotting Scope to see if the Hyperion Zoom MK IV would fit mechanically, either with the supplied or with additional adapters.

This Barlow is designed especially for the Hyperion Zoom, so it gives the best results with this eyepiece. If you have this Barlow already, you can use it with other eyepieces, too - otherwise, a more "generic" barlow like Q-Turret or VIP barlow would probably be a better choice.

Yes, we just tried, it should work.