Building a rockcrawler from scratch

I'm thinking about starting a rock crawler project and I need a couple
recommendations.

Price is an issue but I want to get the right parts for the job.

1) Engine (Which one)

2) Driveline (Transmission, transfer case and axels) I'd prefer not to have
to go with 2 cases so which ever transmission / case I can get with a LOW
1st gear and a good low 4L would be good. I'm thinking about going with full
lenth Dana44s unless I can find an old 1 Ton and pull the 60s off.

3) Long travel coilovers (brand)

Thanks