ɪt wʌz tə hɐvbɪn bˈeɪst ɔnðə hˈʌl ænd tˈɜːɹɪt dɪzˈaɪn ʌvðə tˈiː twˈɛnti bˌʌt wɪð ɐ mˈæksɪməm ˈɑːɹmɚ θˈɪknəs ʌv ɪt wʊd wˈeɪ ˈoʊnli bˌɪn ˈɑːɹmd wɪððə sˈɛvənti sˈɪks ˌɛmˈɛm ɡˈʌn, jˈuːzd ˈiːðɚɹ ɐ tˈoːɹʃən bˈɑːɹ ɔːɹ jˈuːs ðə vˈɜːɾɪkəl vˈɑːluːt spɹˈɪŋ səspˈɛnʃən ʌvðɪ ˈɛm sˈɛvən mˈiːdiəm tˈæŋk ɚɹˈɪdʒɪnəli nˈoʊn æz tˈiː sˈɛvən lˈaɪt tˈæŋk.
It was to have been based on the hull and turret design of the T20 but with a maximum armor thickness of  it would weigh only  been armed with the 76 mm gun, used either a torsion bar or use the vertical volute spring suspension of the M7 Medium Tank (originally known as T7 Light Tank).