Hubble/ACS F814W 5 × 5′′ (~ 33 × 33 kpc) postage stamps of the nine secure spec-z members of PCl J1001+0220. At the redshift of the proto-cluster, F814W almost exactly corresponds to the rest-frame FUV band. The redshift, SFR, circularized effective radius (r_e,circ), and stellar mass for each galaxy is shown in each panel. The nine galaxies exhibit a large diversity of morphologies, from a single, compact (r_e,circ < 0.5′′) bright star-forming clump to larger (r_e,circ ~ 1 − 2′′), multi-component diffuse structures devoid of concentrated light. Many of the proto-cluster members are observed with single or multiple projected companions, a rate which possibly exceeds that of the coeval field (see text).