An AC/intim tank is fairly easy to build. 700 hit points, 90+ AC, 47 blocking DR and mid 60,s intim would not involve a major investrment in time. Mine was 20 Dwarf Ftr Stalwart Defender.
I put epic Vambraces and epic Kundurak shield on mine. These are really easy to get because no one ever wants the bits and they drop all the time.
The downsides. By the time you have chosen all the feats/enhancements to max out this line you will have seriously compromised you DPS.
The game ATM is all about DPS.
You turn up in high end content and wear a shield you will get laughed at (not that that bothered me)
Also ive heard a lot of moaning from the preview server that intim aint that clever anymore. Not heard so much feedback since it went live apart from one guy saying it was weird.
I was going to TR mine so i could up the intim to get The Mari in EDQ2. You need 70 plus for that. However the changes recently mean ive kinda shelved him for now.