Stack two baking sheets together and line the top one with parchment paper.
In a mixer bowl, briskly whisk together water and yeast. Fold in the whole-wheat flour and then briskly whisk in the honey, salt, malt, flax seeds, bran, spelt, (already added) whole-wheat flour and half of the white flour. Knead 10-12 minutes, adding in more as required to make a very slick dough. Let rest 20 m