I doubt anyone can cobble together a usable laptop. But a desktop unit can be done easily. It’ll look like crap, but perform every bit as good as a top of the line Mac Pro.
“15 in. 1440-by-900-pixel LED-backlit glossy display”
Don’t forget the IPS type display, which has considerably better color fidelity than commodity displays. The commodity displays typically reproduce somewhere around 75% of the visible color gamut, whereas the IPS displays are well over 100%, meaning beautiful color with no banding or other artifacts.
That’s one thing that’s very attractive about the 27” iMac, a comparable display alone is over $1000.
Here is what you can get for $2600:
17.3 Full HD (1920x1080) 16:9 LED Backlit Super Clear Glossy Widescreen
nVIDIA GeForce GTX 285M 1GB GDDR3
Intel® Core i7-740QM (1.73~2.93GHz, 45W) w/6M Cache - 4 Cores, 8 Threads
8GB (2 SODIMMS) DDR3/1333 Dual Channel Memory
320GB SATA II 3Gb/s 7,200 RPM Hard Drive (16MB Cache Buffer)
160GB Intel® X25-M SATA Solid-State Drive
4x Blu-Ray Reader/8x Super Multi Combo Drive
I have to question the 512GB SSD in your price. Can you point me to a source? The cheapest OEM price on that size SSD is up around $1800-$1900.