I agree, it can be done, this is what I'm in so far.
1) Rolling Chassis (no cab) 2004 Dodge Ram w/5.7 Hemi & 545RFE trans - $600.00
2) Cab to test drive truck - $500.00
3) Numerous PCM, steering columns, gauges to get truck running - $500.00
4) Motor Mounts - $500.00
5) 545RFE 2 wheel drive tail shaft - $125.00
6) Exhaust manifolds - $125.00
7) 6.1 Intake - $500.00
So far I'm in around $2,850.00 and still need a drive shaft (might be able to cut down the Ram drive shaft).
I'll be able to sell lots of Ram parts (Cab, frame, rims/tires, diff's) once I'm done and running so ill get a little money back there. hope to be in for under $3,000.00 once I'm done.....
One thing I would say is to try and find a donor vehicle for the swap. places like your local insurance auctions and
http://www.copart.com can help save $$$$$.