Dataroma could probably focus on displaying valuation metrics and fundamentals of the Grand Portfolio. Additionally, it would be interesting to see the fundamentals during times of heavy purchasing. Knowing that Wells Fargo is the greatest % of the Grand Protfolio isn't very interesting (most of us could of guess that would be the fact). The Hold Price gives you a little insight but it would be interesting to see other common valuation metrics - especially during quarters where the Super Investors are really buying into positions.
You should also look at simplywall.st. It is a site that uses CapitalIQ data to create infographs and appealing data visualization experiences. You can sign up for a free trial period. You can input your own portfolio, use their stock stock screener, and also use their own 'snowflake' visual summary to get ideas and quickly screen a stock. For me, it is mostly fluff that is unnecessary; but I can recognize the potential as a product for sure.
Here is an intro to simplywall.st snowflake
https://simplywall.st/learning-center/snowflake-introduction