Regretably the Matchbox MoY Scammell 100-tonner is a much larger scale than 1/76, nearer to 1/60. I did attempt to kitbash/scratchbuild one in 1/76 many years ago using bits from several Airfix military models, not completed regretably and I no longer have it. FYI it was based on the Scammell tank transporter, for the front wheels I used those from the German Anti-tank gun and the rear wheels from a Russian T-34 tank. The rear of the chassis was the steering tail from the WW1 tank.