Assumptions
42 point buy. No level adjustment. Standard wealth by level. Limit 2 flaws and traits. All 3.5 material available, including unupdated 3.0. Latest errata for everything. No magazines nor third party. Level bonuses applied to form changes, such as via polymorph. PCs get max HP on first HD and average HP for other HD. Battle Jump requires at least a standard action to trigger.
It's just the astral construct vs. the Fighter. 2 buff rounds.
Build Summary
This guy figures he has one hit. It's all or nothing. Therefore, his build is around getting in that one lovely hit that will down this nasty level 9 astral construct. With all his accuracy buffs and using Deep Impact, he can hit this construct's touch AC on a natural 2.
Just in case he doesn't go first, he has Combat Reflexes, Thicket of Blades, Improved Trip, and a Spiked Chain.
The Hidden Talent power doesn't matter much. Getting him 2PP is enough for his Deep Crystal weapon. He expends his Psionic Focus to trigger Deep Impact then the 2PP to fuel the Deep Crystal weapon.
With these rules, he doesn't even need proficiency to hit.
I wasn't sure how legal an item of heroics was for extra feats. This build performs well, even without it.
Warforged Stats
26 STR = 18 base + 2 levels + 2 item + 4 expansion
14 DEX = 18 - 2 template + 2 item - 4 expansion
18 CON = 12 base + 2 race + 2 template + 2 item
14 INT = 14 base
6 WIS = 8 base - 2 race
6 CHA = 8 base - 2 race
Dragonborn Warforged Fighter10
1: {Aggressive}, {Quick}, {Shaky}, {Vulnerable}
1: [Battle Jump], Combat Reflexes, Hidden Talent: astral construct, Improved Initiative
2: [Power Attack]
3: Psionic Weapon
4: [Improved Trip]
6: [Martial Study: Shield Block], Deep Impact
8: [Combat Expertise]
9: Leap Attack
10: [Martial Stance; Thicket of Blades]
Relevant Equipment (49,000G is ECL10 Wealth by Level)
-Deep Crystal +1 Construct Bane Valorous Spiked Chain (effectively a +3 weapon)
-Item of expansion at manifester level 7
-Item of a Devoted Spirit maneuver (Shield Block chosen)
+2 STR, +2 DEX, and +2 CON items
+Jump item
He has plenty of wealth to spare, but his defenses don't mean much. He'll probably be hit anyway.
Damage Analysis
12d6 Huge Spiked Chain base damage (3d6) x4 from Battle Jump, Dragonborn Dive, and a Valorous weapon
+ 2d6 (Deep Crystal)
+ 2d6+8 (Construct Bane with the plus quadrupled)
+160 (Power Attack with Leap Attack x4)
+4 (+1 weapon x4)
+32 (+8 STR modifier x4)
Final Notes
Y'all can probably do better. Then again, if this Hood hits with everything, he should expect to one-shot said Construct. Taking Leaping Dragon Stance may be better than Thicket of Blades for reliable jump attacks.