EllisDee37's Tempest Trapmonkey build is not obsolete in any way. If you want a first life character with almost all Ranger levels that has powerful TWF melee plus trapping (plus good ranged DPS "for free") then I think that is just about an ideal setup. The Fighter splash is not necessary but it costs you very little from your Ranger side.
From EllisDee37's build you can see that INT 14 is fine on a Human to keep up all of Concentration, Disable Device, Heal, Search, Spot, and Use Magic Device. With an Elf or Drow you would need to go INT 16 to do the same. You will need to invest in tomes or drop some of the skills if you don't feel that they matter to your playstyle. Note that Open Locks is not on the list because most locks can be opened with low skills, a good +Open Lock item, good thief tools, and patience. If you want to max it out too so that you can get the harder locks, you will need higher INT, a tome, and/or to drop other skills.
DEX-based combat is considered a "trap" for endgame play in most cases since you can stack a lot more bonuses to STR than you can to DEX. There are valid reasons to go DEX-based but it is not the min-max choice so make sure that it is something you really want to do. For more casual players there is not a huge difference between the two, but even without any sort of rare gear a Ranger can self-cast Ram's Might and will get a bigger boost to STR-based damage that way than to DEX-based damage, and the Rage spell is easy for anyone to get and it only helps with STR-based damage. The main reason why people pick up higher DEX scores anyway is to qualify for some feats that require high DEX, such as the Two Weapon Fighting line and Improved Precise Shot, or for ranged damage. However as a Ranger you get the main DEX feats for free as well as Bow Strength for free so you can even dump your DEX and it will not affect you much at all other than somewhat lower Reflex saves.
However if by "Perfect Tempest TWF" you mean the most min-max TWF fighting character with trap skills then that would probably have no Ranger levels at all and is instead be something like a Ftr12/Mnk6/Rog2 "Centered Kensei" STR-based build, but I doubt that you can pull that off effectively with a 28 point character. For a character with a Ranger icon a Rgr11/Ftr8/Rog1 split (or maybe /Art1) with Keen Edge for its Tier 5 enhancement probably offers the most melee DPS alongside trapping but will be much less survivable than a Centered Kensei in harder content, and it gets a lot less skill points than a Tempest Trapmonkey so it will require tomes and higher stat build points to achieve proper trapping skills.