Last month, we got to see an early
preview of UDON Comics' upcoming UDON x Capcom Sketchbook Alpha art book, which comes out later this month on June 15th, 2020. On Twitter, UDON's Matt Moylan shared an additional page from the 48-page art book, showing some more of the scrapped DLC costume concepts by UDON from the Street Fighter IV
era. All of the unused concepts are indeed "mech-inspired" versions of several characters from the SF4 cast.