A way to restore a DB

Dear gurus !
We are evaluating a "strange" way to "recover" a production DB. This is a 3.7 TB database, still growing, with LOTS of data inserted every 5 minutes (and several partitions belonging to several tables get dropped each day - we keep historical data for 90 days back), which we used to backup with RMAN to HP Omniback controlled tapes. We had a failure, and it took almost 48 hours to restore/recover the DB (in addition to backed DB files, I had to restore thousands of archived logs from tapes and apply them to the DB).
We can not afford to have the DB down for 2 days. Now, we decided to give up RMAN hot backup, actually to give up backup (in it's classic meaning) at all.
I'll explain why: It's very important for us to get the DB up & running ASAP after a crash. We want the DB operating much more than we care about historical data that reside in our DB. Our goal is to enable the inserts
(which run every 5 minutes, as I have stated) ASAP.
So, we plan to do the following backup/recovery procedures:  

1. We want to generate a script that will build the basics of the DB - create the DB and the instance, build tablespaces, users, grants, roles etc...
2. We want to create a daily export of small (but the most important) configuration tables, which can be imported very quickly after the crash and rebuild of DB. At this point the DB is operational.
3. We can now import the large data tables - partition by partition. And I don't care if THIS step will take 2 weeks.

What do you say ?
Any reviews of my steps and the idea in general ? And , do you have a script that can re-engineer a DB (as in my step 1) ? Thanks a lot in advance.

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