If you're looking for a best-of-class do it all gangbanger today, then you're looking at a very tough row to hoe.
It isn't that there is no way to make one, but due to an utter and complete ignorance of the market as to their capability, noone is actually making one.
I have a 19 year old Haas MiniLathe, and it's the fastest and most capable freakin' turning machine this side of a swiss.
Unfortunately, it is also very "Haasified".
Meaning they've completely abandoned it 3 years after introduction because they had no idea how to market it to get get the annual sales up-to their required level.
All others currently on the market are pretty much limited to be set up for medium production runs or quick secondary ops.
Medium production runs which may not qualify or warrant a swiss, quick second ops that would be an abomination to put on a turret machine.
For the quick second ops you only have a couple or three tools at max, the medium runs have a complete set of very specialized custom tools to do whatever is needed.
The typical gang tool machines have a very limited clearance in X, meaning you will be fighting for elbow room at all times.
You may gain some of that by having a larger X-travel, but the most I've found was something like 18" or so....
Sounds like a lot, but it really isn't, specially not when you add in the typical 5C collet nose diameter of 3.5" which you need to stay clear of.
Slant or horizontal, 18" requires a pretty deep machine.
OK, so you make your X axis vertical ....
Some have figured out that going vertical reduces footprint greatly ... except they they did not make their machine more capable, just smaller.
Others recognized that very same problem, so instead of more travel or vertical, they've gone to a horizontal turret installed on a gangtool platform,
as-if that makes any fucking sense!
You see, the very benefit of a gang tool lathe is twofold:
1: With no real toolchange, your tool-to-tool time involves just enough X/Z movement as to not crash into the spindle.
IOW, your depart and clearance move of the previous tool is the approach move of the next tool.
2: Having no turret, your accuracy is entirely limited to the capability of the X and Z axes. Add the turret, and you're adding not only another variable
to the accuracy of the machine, but also the added time to retract, index and approach again....
Anyhow, I can go on and on about the stupidity of MTB's ignorance of what a gang tool machine could be capable of.
Instead, I wish you Good Luck in your endeavor finding a suitable gang tool lathe, which ( in my opinion ) is doomed to become a spectacular excersize in futility.