Solaris system and database migration help

HI,

let me explain you the current situation.

We have three server with OS Solaris and oracle products. Following is the somewhat detail,

1st Server= oracle DB
2nd Server= Oracle Warehouse builder
3rd Server= Oracle Business Intelligence Enterprise Manager

Question: these three servers will be down for one month due to some reason. We have to prepare a temporary single Server which will work exactly like these three servers. Oracle DB,OWB and OBIEE will be installed on this single server.

I require some help like,
What informatoins of three Servers ,regarding OS and Oracle, are needed to know before preparing the new single server?

Note: all these are production server