I am new to this and have been looking at multiple options --
Option 1 - Build a joes cnc hybrid
[Why is this your only option, besides the one machine you found on ebay? There are plenty of kits more advanced than the "Joe's", which is showing its age.]
Option 2 - Buy from this guy -
CNC Router 48x48 | eBay
[This ad leaves out a lot of crucial information you (or anyone) would need to evaluate the machine. What kind of slides does it use? What are these "oversized" motors? He doesn't say what the "latest in microstepping drivers" are - they could be anything. Claiming "0" backlash on a rack and pinion system invites more skepticism than confidence, without a lot more information about the system used. T-slots in MDF are of questionable usefulness. I'm not saying this is necessarily a bad machine, but skipping all the most important details makes it suspect. Look for a machine that tells you what it's made of, preferably with a user base that's enthusiastic about it.]
Further more - Is this machine considered a 4-axis or 3 axis - Can it do 3-d stuff
[It's a 3-axis machine until you add the rotary table, Yes, it should be able to do 3D carving, as long as the Z axis can run at the same time as X and/or Y.]
Do I just need Mach3 and V-carve pro?
[It seems to come with Mach3, but sometimes that's an evaluation version limited to 500 lines of code. V-carve Pro isn't a true 3D program; it's used for 2D and 2.5D work, mostly by sign-makers. For 3D work, you'd need a 3D-capable design program and a CAM program that could analyze your 3D CAD models and produce G-code from them.]
If I guy from the guy on ebay is the Rotary 4th axis for 3d work worth it for $450 ----what additional software is needed for this?
TIA