Interesting attempt and guessing the ins and outs and all considered don't think you are a million miles out. Two points I'd add:
The additional revenue from advertising pitch-side, in program, match/ball sponsorship, etc at Old Firm is a factor toward the £200-250k figure 'Flow mentioned a few years back. Also applies to Cup Games.
When it comes to TV money, is there not a double payment when the game is on two broadcasters like Saturday? BBC and Sky had the game on so I believe that is double the usual fee?
Whatever the numbers are, the point is we will be walking off at the end of the season with a balance sheet way beyond what we could have imagined at start of the season. However, the key for me is how we utilise those funds and the run of 2nd place finishes showed that we never made the most of the additional income. It's utterly refreshing to see a much more pragmatic approach to the financials at the club and the extra cash this way will be invested wisely rather than deployed on player recruitment - new scoreboard and tannoy system, money into youth development, etc which is exactly what it should be for.
With the change to Europeans qualification made a few years back, we have to win to qualify for Europa League next year which could make the cup run even more rewarding financially.