Optical parametric chirped-pulse amplification implemented using multikilojoule Nd:glass pump lasers is a promising approach for producing ultra-intense pulses (>10<sup>23</sup> W/cm<sup>2</sup>). We report on the MTW-OPAL Laser System, an optical parametric amplifier line (OPAL) pumped by the Nd:doped portion of the Multi-Terawatt (MTW) laser. This midscale prototype was designed to produce 0.5-PW pulses with technologies scalable to tens of PW’s. Technology choices made for MTW-OPAL were guided by the longer-term goal of two full-scale OPAL’s pumped by the OMEGA EP laser to produce 2 x 25-PW beams that would be co-located with kilojoule-nanosecond UV beams. Several MTW-OPAL campaigns that have been completed since “first light” in March 2020 show that laser design is fundamentally sound, and optimization continues as we prepare for “first focus” campaigns later this year.