Afaik there are no 9-speed DT shifters. DT usually means friction.

That crank will need a 109.5 Octalink BB - figure a minimum of $40 - and possibly bolts as none are shown.

I don't understand your thinking here. You need a FD and RD to use your current crank (and presumably BB), yet you believe (crank + BB + FD + RD) will be cheaper than that?? What you been smokin'?

Besides, don't be fooled into thinking that those auctions will end anywhere near their current prices. You effectively have no idea what the relative costs are.