A minor detail about the Twist.

It's got a symmetrical wing.
It's expected that the model will be upside down about as much as right side up.
It's got a very light wingloading.
It's designed as a 3D and the expectation is to pull it around with the prop, not the wing.

A setup like that almost always has the wing lined up with the CL of the fuselage.
You'll seldom see up or down thrust on the engine.

Block the sucker to sit level on your picnic table.
Stand off to the side 5-10 feet and look at the airplane.

If the stab/elevator looks to be on the same line as the wing, it's good to go. If the prop looks to be at 90degrees to the wing, it's good to go.

If you must use a tool and want to nitpick the sucker, then while the airplane is sitting on the picnic table. Put the incidence meter on the wing and record the readout. Then do the stab/elevator and you got your nits. If you're that particular, then you need to make an accurately flat replacement for your prop in order to read it's position accurately. Using the prop will not be accurate at all. A disc of 1/8" plywood works good and doesn't actually have to be a 360degree disc.