Are you on the latest patch (1.9.0) like me? I had trouble getting the rupees code to work at first, too, but then I discovered I needed to add 1CC0 to each code in the post you quoted and it gave me a valid address. Rupees I found off of another post, so I'll share this with you here. I went to the memory viewer tab after connecting, and put 3560F8E4 in the green memory address space, then clicked update. Then I put 0098967F in the blank on the left side and clicked Poke, then that maxed out my rupees. For the rest, you should be able to add 1CC0 to.
Here's a hex calculator:
http://www.csgnetwork.com/hexaddsubcalc.html
So, let's say you want to get the max number of Metal Plate and Monster Teeth. You take 35621804 from the cheats.txt of the post you linked to, go to that calculator I linked, and enter it in the top blank. In the second blank, add 1CC0. Your result in the Calculated Hex Addition section should be 356234c4. Search for this memory address by pasting it in, and then enter 03E703E7 in the left blank and poke it. You should then have 999 of those items (and modifying the rest should be easy too, since all of the addresses for the remaining materials are all next to one another).
Hope this helps. Once everything connected properly, this was actually a breeze. I've no clue about modifying weapons or anything, but I messed with simple stuff last night lol.