just a consideration for you. instead of repeating your current base plan bike workouts, add 3 weeks of the SSB2 plan bike workouts (LV unless you have extensive indoor training history). then do week 8 of your base plan as recovery and proceed to build. this way you change the stimulus a bit and you have a nice preparation for the VO2max and over/under work coming up during build.
you are left with 1 extra week. use it as buffer for if you get sick or have to travel. if you still have the week over during the last weeks of specialty you can repeat a week of that plan.
finally why don’t you meet us in the The Ironman in 2019 thread
happy training!