Since the original question was about build up work, here's weeks 5-10 when I'm at the highest volume (I'm doing this for a 3rd time right now) of build up work. To the question about Vo2 and lactic work, I follow the Lydiard running phases and the David Wright swim program, which is Lydiard bases:
Monday:
swim 8k mr (mr: all at once or broken in half with focus on drill, steady pace and recovery. 1000 fist glove warm up)
4 hour break
bike 4 hour recovery
run 60 + 10 100m strides(directly after bike with 20min of Pose drills in between. recovery building into a medium pace)
Tuesday:
swim 10k l (l: strong aerobic pace with AeT, AT sets. 800's, 1000's, 1500's, 2k's, 3k's, 4k's)
8 hour break
run 90 (50-60 AT)20min Pose drills/core exercises before and 20min after run
Wednesday:
swim 8k mr 1000 fist glove warm up
4 hour break
bike 4-5 hour AeT
run 60 + 10 100m HILL strides(directly after bike with 20min of Pose drills in between. recovery building into a medium pace)
Thursday:
swim 10k l
8 hour break
run 90 (5-6 x 8min AT, 2min AeT)20min Pose drills/core exercises before and 20min after run
Friday:
swim 8k mr 1000 fist glove warm up
4 hour break
bike 4-5 hour AeT
run 60 + 10 100m strides(directly after bike with 20min of Pose drills in between. recovery building into a medium pace)
Saturday:
swim 10k l
6 hour break
run 120 build into AeT
Sunday:
bike 3 hour AT group ride
6 hour break
60 minute hill fartleks (AT on the hills, AeT on the downhill) 20min Pose drills/core exercises before and 20min after run