Yeah, IMO your HP might be a tad low for Mech. That final gauntlet will be very very hard.
My suggestion.
You're 1st half Kara ready no problem. Start looking for a Kara guild. I'd say you'd be able to OT up to Prince.
Your waist could use a upgrade. I used the H. Ramps ones for a while.
For my back, I'm still using Devilshark cape from SV. Nothing wrong with yours tho... I just prefer the dodge. No damage > less damage.
Here's the sticky of good heroic gear suggestions
Heroic ready link In Heroics you really should not step foot in there w/o all blue items. It's kind of a progression (greens --> blues in normal runs; blues --> purples in Heroics). Not to mention people will drop you from a heroics party if you're in greens lol. I've seen it happen (not to me.. I refused to enter Heroics until ready... except for one time where a buddy basically forced me to go... and I gave full warning.
Just remember consumables if you do try Mech. Scrolls of Protection, elixirs of defense, etc. +30stam foods, etc. If you want to make the 2nd boss easier for everyone bring fire resist or protection pots.
I'd take a look at the sticky, and always try for the better gear listed there.