By the time you've connected all those extras diodes and capacitors to control the CS pin, what did you gain? You have no I/O pins left and it won't be smaller/simpler/lower power than using a Pro Mini.
The reason I am trying so hard to get it to work with the attiny is because am in a high school class {engineering} and at the moment we have the attiny microcontrollers with us. Buying as many arduino mini pro's as we need would not fit our budget as well. If we only needed 1 device and size did not matter it would be perfect and there'd be no point in messing with the attiny. The only other two peices of equiptment that will need to be attached to the attiny is a LED and a piezo buzzer. If it comes down to it i could just use 1 pin for both of them.
Where does the data you're transmitting come from? What can you do with it if you've go no pins left?
What I want in the end is to have an arduino UNO that will transmit any type of data to the receiver, the receiver will then look at the data and match it up with a certain command such as blinking light patterns or noise patterns.
@danieljay I am not sure if I read over everything correctly but in the end would this process allow me to only use 5 pins out of the 8 total? Leaving me the reset pin, and the two analog pins (physical pins 1,2,3) to use for outputs?