Okay...
First; If the StatRes table is gone, your historical data is gone...
Second; You can use an existing Layout Template to create a new Layout...
Open DMA against whichever Data Sourcer contains the Layout you want to "replace".
Navigate to: "ODS Database">Report Layouts>Resources
Right-Mouse-Click on the Resources Folder.
Select "New"
Select your previous/old Layout [i]Template [/i] from the list provided
Give your new Layout a new Layout Name and Description and click Next
Select the Objects you want the Layout to report on and click Next
Select the Statistics you want the Layout to report on (this should be pre-populated but you may want to add or delete some stats...) then click Next
Select a Time Profile for the Stats to be collected - this may be every 15 minutes, or hourly, or daily, etc. depending on which time profile you select then click Finish
It may take a few hours (or a day...) for the Layout to start collating data, as the ODS will first be updated by the System (ETL) and this is dependant on the level of Aggregation. Be patient!

You will then need to use ETL Assistant to determine which Tables should be used in your Brio Report... and also set up purging rules against your datamart data tables... but that's another story...

I hope this helps...?
Tony