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We give a modification of Mitchell's technique for adding objects of size$\omega_2$ with conditions with finite working parts in which the collectionsof models used as side conditions are very highly structured, arguably makingthem more wieldy. We use one such forcing (essentially a `pure side conditions'forcing) to answer affirmatively the question, asked independently by Shelahand Velleman in the late 1980s, as to whether a $(\kappa^+,1)$-simplifiedmorass can be added by a forcing with working parts of size $<\kappa$.

Mitchell-style forcing, with small working parts and collections of models as side conditions, and gap-one simplified morasses