I like your plan MOD. I am working on the template for my triathlon in September and I came up with basically the same idea.
For the next 6 weeks (I am working on the Mass Gain Plan) here is what I am doing.
One workout per week of each swimming, running and biking.
Swimming is easy because I love the water and we will be going on a regular basis up to our little slice of heaven we call the Redneck Resort. I have access to both an olympic pool and a spring fed lake for open water swims. I will start with really simple intervals (100's, 200's, 400's, 800's) and longer swims in the open water.
Running is a little different. I am going to run intervals for 3 weeks out of the month than take 1 longer run the 4th week. The longer run will be at race pace minus 30 seconds or so. Intervals will be same as swimming except for no 100's. I only plan on running one time per week for the next 8 weeks.
Biking I plan on spending one day riding. Most of the rides will be longer rides with my sister. She is a triathlete also. On the longer rides we do big ring intervals starting with 3 X 5 minutes working up to 5 X 5 minutes. On the shorter rides I will be hitting a loop I run that is 15 miles and I will work that for time. With traffic my goal is to be able to run it 45 minutes or better consistently.
BTW I think this is my official 100th post!
I also am not competitive at 6' 1" and 188lb's but man I love it.