hardi board IS an option..... though ive never done it and am a little intimidated by it....
Don't be intimidated by it. You'd be intimidated by how I have to install it, in a High Velocity Wind Zone. Doing anything outsize of a High Velocity Wind Zone (i.e. hurricane prone location) is cake with icing. Presuming you don't have an air nailer, here's how to do it.
Get the following a set of tools: Malco FCG2 (hanging tools), Dewalt Fiber Cement Shear, Hitachi Hardi-Blade, your 4' level, your stud finder, a 5/32" masonry drill bit, a 1/2" masonry bit, a sharpie marker, a #2 square drive, two cordless drills and several boxes of these
http://www.mcfeelys.com/fiber-cement-screws.
Either: Cut strips of tyvek house wrap, or peel-n-stick to make flashing for the **** joints in your planking. (I liked the Peel-n-stick for simplicity).
Prep and weatherize your sheathing per your local AHJ requirements. Use the stud finder and mark your studs about 6" up from the bottom of the wall, and along the top of the wall. Start by installing your corner trim boards. (These make the frame to work between and measure between.) Pilot hole the screw holes through the corner trim boards and planks (if necessary), if you find it is not necessary, skip that step. Use the 1/2" bit to countersink the screws in the corner trim boards, (if necessary). Once the trim boards are hung, Mark the first plank with a straight edge, and cut the entire plank into several starter strips 2" wide using the Dewalt shear. Install starter strips using your level and the screws (aim for the studs, that's why you marked them). Once the starter course is in place, use the Malco tools ~1/3 in from each plank end to stack planks, using flashing at all the ****-end seams, and staggering the end seams. Check the first couple planks with a level from time to time, until you get a feel for whether you need to check every plank. Word on the street is that the 4" reveal planks tend to sag more in the middle than the wider planks.
If this sounds complicated, it's not. By the third plank, you start to get a rhythm going, and stop having to worry about what you need to do next. I was hanging 6" reveal (7-1/4" planks). In a High Velocity Wind Zone (HVWZ) I have to screw through both planks, so I estimate my time to hang was doubled by having to drill and countersink all 12 screws in every plank I hung. (my studs are 12" O.C. and the AHJ said hit every stud!)
To hide the screws in the trim boards, get a piece of plastic soda bottle (to use as a putty knife), cut it about 2"x1-1/4". Fill the screw head with caulking, and run the plastic knife along parallel to the wood grain. This will transfer the wood grain effect to the caulking to make the screw nearly disappear. If you find your caulk shrinks excessively, do it again.