That's all I did to make that scenario. To be clear, I am not the original author. IIRC, that scenario was included with the original version of Steel Beasts. I think someone else imported it to Pro PE, and I just changed the unit types when the T-72 became fully playable. I've modified many existing scenarios that way to suit my preferences. The only reason I posted that one was so that other people didn't get the 'spoiler' of seeing the enemy routes. (Even though they're actually random.)
A more modern, updated version is "Tanks! Again", by MDF. His scenario allows you to choose your tank and the general type of enemy you'll face. I highly recommend that one.