Yes the motor is 1/2 HP.
The Z travel is listed as...
Max Dist. spindle nose to table: 17.5"
I listed the 550lbs just as a kind of average. Most of the machines get shipped with a stand packaged with it so the 550lbs includes the weight of the stand and the crate. I repackage them before I ship them out because the factory crates are pretty thin. I use 7/16 OSB on a 2 x 4 crate frame which is a little on the heavy side but a lot stronger than the paper thin factory crates. I have never had any trouble from my shipper with what I list on the BOL as far as the weight goes.
If you are interested in the exact weight of the machine, the stand and the crate I would be happy to look it up for you.