This may not be welcome, but a general comment on DADGAD tuning:

This is an extremely modal tuning. You use it only in the key of D, and not even in the relative minor (Bm). When I suggested above that you need only three chords in DADGAD, this is generally true -- even for songs that use more chords in other tunings.

But DADGAD isn't really a tuning where one should think in chords. Note that the basic D chord in DADGAD needs only one finger; it's chorded 000200. And this gives you the notes DADAAD. A modal D -- no third.

Which means it has drone strings everywhere. It's basically a mountain dulcimer tuning. You get maximum "Scottishness" out of it by not playing chords. You play the melody and let the strings drone.

As an experiment, I just played through two of my favorite DADGAD tunes, "Bonnie Susie Cleland" and "A Man's A Man for A' That," and was fingering only one string for about 75% of both songs. There are times when you need more (particularly for the IV chord, which is the hardest in DADGAD). But for notes that sound on the I or V chords, it's usually better to just play the melody and let the drones sound.

OK, chord theory lecture mode OFF. :-)