Paf! You beat me to it. Drats, now it'll look like I'm scurrying to comply.
*scurryscurry*
Behold! Some crunchiness! I hope I did the skills and so on correctly. I've never used those rules from UA before. If I goofed, just lemme know. This build assumes Rogue as 1st level, then 4 levels of fighter. The next 2 levels will be rogue, then I should be able to hit Shadowdancer. I may also take some Paragon levels. We shall see.
Hey, do you allow any of the Tiefling feats from Races of Faerun?
Background and description to be completed soon (sadly nothing to compete with Blue Kryptonite

).
[sblock]Name: Thorn
Race: Tiefling
Class/Level: Rogue 1/Fighter 4
Strength (STR) 14 +2 (6)
Dexterity (DEX) 20 (18) +5 (10)
Constitution (CON) 14 +2 (6)
Intelligence (INT) 14 +2 (2)
Wisdom (WIS) 10 +0 (2)
Charisma (CHA) 12 +1 (6)
Alignment: Neutral
AC: 22 (+5 Dex, +7 Defense)
Hit Points: 38/38 (avg)
Movement: 30'
Base Attack Bonus: +4
Init: +5
Melee Attack: +6
Ranged Attack: +9
Fort: +8
Reflex: +10
Will: +3
Race Abilities
-+2 Dex, +2 Int, -2 Cha
-Darkness 1/day
-Resistance 5 to Fire, Cold, Electricity
-Native Outsider
-Darkvision 60'
-+2 Hide and Bluff
Class Abilities:
-Sneak Attack 1d6
-Trapfinding
-Bonus Feats
Exotic Weapon: Spiked Chain
Weapon Finesse
Weapon Specialization
Skills:
Bluff (Cha) +9 +2
Climb (Str) +10
Disable Device (Int) +10 +2
Escape Artist (Dex) +13
Hide (Dex) +13 +2
Jump (Str) +10 +2
Move Silently (Dex) +13
Open Lock (Dex) +13 +2
Perform: Dance (Cha) +9
Search (Int) +10
Tumble (Dex) +13 +2
Feats
1 Dodge
F1 Proficiency: Exotic
3 Combat Reflexes
F2 Weapon Finesse
F4 Weapon Specialization: Chain
Languages - Common, Infernal, Celestial
Money - 48gp 5sp
Weapons -
Spiked Chain +1 ToHit: +10, Dmg: 2d4+6, Wgt:15, Special: Cold Iron, Cost: 4325gp
Armour - Bonus Max Dex Check Arcane Fail Wgt
None
Gear -
Backpack, Wgt: 2lbs, Cost: 2gp
Bedroll, Wgt: 5lbs, Cost: 5sp
Flint & Steel, Wgt: 1lb, Cost: 1gp
Small Steel Mirror, Wgt: 1lb, Cost: 10gp
2 Belt Pouches, Wgt: 1lb, Cost: 2gp
Waterskin, Wgt: 4lbs, Cost: 1gp
Masterwork Thief tools, Wgt: 1lb, Cost 100gp
Magic -
Gloves of Dexterity +2 4000gp
Cloak of Resistance +2 4000gp
Potion of CLW 50gp
Potion of Shield of Faith +2 50gp[/sblock]