i don't record 2 first "waves" with demoknight's & Giant Charged Soldiers
there are to easy, and we done it off screen
i used Cow Mangler 5000 with Buff Banner (Festive)
Tips:
up to max all resist as soon as possible (before 2 "wave")
upgrade speed for slow classes
deal with Giatns on the first road, dont let hem split up or reach the bomb hatch
make bomb restarst offen
attack giant Medic with all team and in one time
when Tank come out, use one of players to protcet bomb, other take care of Tank
and of course, watch out the Spy!