The idea behind this is to reduce the large amount of DC/DC converters ( LDD1000h ) and replace it with a cheaper device ( MOSFET ) that outperforms it.
A better way of going about this is the Vishay
SUP50N10. This MOSFET is capable of 50A continuous ( 60A peak ) drain current and 100V are around $1.25 VS the $10 for each LDD1000h which has a puny 1A output.
By moving away from dedicated, expensive DC/DC Current and robbing useful PWM outputs from the micro controller. Now you can drive large chains of either serial or parallel LED's without breaking your wallet!
As stated earlier, on board Input Voltage and Current Monitor will be retained. With a bit of code and this can be used to track power consumption.
This might just be the ultimate solution for those that want a flexible DIY High Power LED Driver / Controller that would allows to start off with a basic setup and move up as budget allows!