Can I ask (respectfully as I own a Dingwall) what makes a Z3 worth 4x the price of a NG3? Inknow the wood and place of manufacturing differs - what else? I play guitar also and think about a Les Paul standard at 2800 vs a historic (obvious differences also) at approx 5k and wonder why such a huge jump in the Dingwall stuff.
And again, as someone who purposely hides the amount of inventory in my music room (out of embarrassment) there is no judgement here.
As a Z owner I have multiple times wondered if I’m crazy for spending the money I spent on them when the Chinese basses are as fantastic as they are. Then I play one and I'm reminded why I’ve gone the route I have.
I will also state that I’m not a Tone nazi. I think soo much of it comes from the player that it’s really unfair to state that my Zs sound better then say a squire.....
For the differences that justify the price:
...Actually, before going into that let’s start at basic pricing for comparison purposes.
In this picture we have an DG EDition and a fairly basic Z and both are similarly spec’d.
The DGNG is about $3200
The Z is about $6500
It is missing the DGTC so add that in for another $700 bringing it up to $7200 for a pretty close apples to apples comparison. With that, out price difference is over double but under 3x the cost. So definitely not 4x the cost.
with that here are some differences. The justification is purely a personal choice

.
-the bridge with the routed sustain block. I do love this bridge over the hipshot ones on the combustions.
-the neck..... I’m addicted to the Z neck. I’ve played some combustion’s with stellar necks that resemble an AB neck and others have felt quite chunky in my hands.
-the push/pull active/passive vs the toggle. Minor difference here but...refinement?
-the ergonomics. Body shape, size, how it hangs.
- the customization options from factory.
as you mentioned different woods falls into this category. The wenge necks are truly remarkable. I’m a sucker for these exotic aspects. Birds eye maple is most likely my fav fretboard wood. But Zirocote, Ebony are some fantastic options that jack your price up. Wenge fretboards are not an option on combustions but most love the wenge FB.
The Z pictures about includes an X top and a wenge contrast layer. That is approximately a $1250CAD upgrade over the bustin models. Body woods options as well fluctuate the price.
in addition to woods though you have the option of different pick ups and pre amp(glockenklang) as well as the addition of the 3x switches.
-the extra work required for the break angle on the head stock vs the string retainer on the bustin models. Matching X wood head stocks as well I guess
-custom finish as well?
I think that sums up most of it at least.
my latest build was quite highly spec’d/personalized and came in just over 3x times the cost of the DGNG shown above. ..... and I freaking love it.
hope that helps?