Hi Penn,
I agree with P38 look in your manual for hearth requirements. My buddy and I built the pad you see in my pic. You will need to look for clearances and R ratings.
What we did was look at the minimum clearance requirements for the installation and then made the call on the pad.
Supplies were 2X4's, 5/8 inch plywood, 1/2 inch Durock, tiles, trim board, tile adhesive, tile grout, screws, tile spacers, and nails.
Basically decide on the shape of your board and use the plywood as your base, then screw in your 2X4 to the outside of plywood(this will support the pad and also be what you will nail your trim too later). I also put two boards in the middle of the hearth to give extra support where the stove was footprint would be.
Next flip the board over so that 2X4 are the new base. Cut the Durock and fit on top of the plywood. Screw into the plywood (note: be careful on the length of your screws if too long they will scratch your floor when your heavy stove is placed on top of the pad).
Then measure and cut your trim to fit the outside of the pad. Use small nails to secure.
Figure out your tile placement on top of the Durock and use the adhesive to place them on(don't forget your spacers). Let adhesive dry.
When dry add grout. Then touch up any small things that came about.
It is somewhat of a lengthy process overall but the advantage of doing it yourself is that you can pick out the tile etc and have it match your home/stove and save some money.
Disadvantage TIME
lol By the time you go the store and buy materials etc and then set your tiles for drying it turns into about a 2 day project 4-5 hours one day, and a couple the next.
I have some pics I can email you, I just cant upload them on here for some reason.
Hope this helps a little