Don't take this the wrong way, but.... I wouldn't want to play any game you designed.
------random musings
I've always hated games (P&P or computer) where the money had weight. And I say this as someone who's worked in the cash room at an amusemant park. I know that coinage is stupidly heavy.
(Of course, it had potential for Sadistic GM Tricks...... "You killed the dragon! Huzzah! Ok, it has 50000gp worth of treasure. But.... it's all in Copper Pieces! Let's see, 1oz per cp, 16oz to the pound - heck, I'll be nice and round down! 150 TONS of copper! Load up, boys. ")