Help on design!

I am new to VB, new to .Net and new to Visual Studio.
I am using Visual studio 2005 Beta2
I have been at it for about one month.

I have an application in mind that is heavy in number crunching and low on
queries.
It can best be described as follows:
its a disconnected data base.
UI - 20%
Data querying -15%
Number crunching - 35%
Screen/Printed reports - 15%
Data Access from websites (disconnected after intial download) - 15%
My proposal for the project is NOT to use SQLExpress.
To use strongly typed,fixed length arrays with the Array.sort; array.find
methods.
To query with array.findall (the delegate/predicate thing is solved.)
To use ADO datatables,datasets for binding and obtaining changes.
To use my code for merging etc.
A typical set of datafiles will be about ten files. The largest will be
about 60MB and 60,000 rows.
The data files will be variable width delimited text files using my
encryption/decryption.
Is my proposal feasible?
Also I did not intend to use crystal reports rather I hoped to use standard
toolbox items.
Any suggestions on how I should plan this project.
As a separate matter I have another question related to data binding.
Before I get into that I am hoping for helpful suggestions.



--
Roger
.