Development and planning

Over the last few weeks i have been trying to list some ideas on what i could use for a structure. I need to be honest im getting a bit stuck, i keep changing my mind, i wondering if i have bitten off more than i can chew.

I feel I am really being tested towards my knowledge of theory. Im supposed to be a grade 5 Musician here but Im finding i have to really think about the scales im using.  My intial idea was the CD would be around 30 mins or so, but it is looking like it could be alot longer. I timed one of the exercise based on an octave scale, going from C to G then down the lower side and back up again at 110bpm, this took 3 and half mins.

I think its safe to say that the structure will be based on a simple formula of,
WARM UPS
EXERCISES
COOL DOWNS

Next steps some recording to investigate the technical side of this.