eh..... not going to happen on a laptop, even a core 2 duo system with centrino duo mobile technology ur 3-4 hours will get drained quickly with ur designing and engineering.... May i suggest a Desktop?
Processor: Intel Core 2 Duo E6600 - $308.00
Motherboard: Gigabyte DS3 - $94.99
Memory: G Skill 2x1GB DDR2-800 - $144.00
Video Card: eVGA 8800GTS 320MB - $304.99 (an Nvidia Quadro FX 4600 or FX 5600)
Hard Drive: Western Digital 400GB - $99.99
Optical Drive: LG 18X DVD+/RW - $29.99
Monitor: HannsG 19" LCD - $174.99
Keyboard: Logitech Media Elite - $23.99
Mouse: Microsoft B7G 5-Buttons - $24.99
Speakers: Logitech X-230 - $40.99
Power Supply: Antec TruePower 650W - $109.99
Case: Antec 900 - $119.99
Total Comes to: $1476.89 (w/o shipping)