Seeing the plan written down like that... it looks good to me
But where I said 70+ mins for your first Sunday run... I wasn't that clear, but really meant something over 70 minutes. You can give it a try if you like, but probably add 2 or 3 minutes to your target times for each of those long runs. Save beating your PB either for your next 10K race... or at least for a few more weeks.
I do indeed have a brand new car - I appreciate that I'm lucky with this. But it just comes with my job. It does NOT mean I'm rich and that you can inflate your quotation. In fact, I have nothing spare.
First thing... going from couch to 10K, with your physique, is an impressive feat in 7 weeks. Well done!
Second thing... I doubt that your body is really ready to do much more at the moment... your heart and lungs have obviously adapted to some degree, but your legs have been taking a lot of repetitive high stresses... and it takes a lot more time for your bones and tendons to adapt. With the amount of progress you've made, they've probably been accumulating microdamage faster than it's been repairing itself. So having a little dip in your training for a week or so is actually a very good thing.
After that, assuming you're running 3 days a week, I'd have a month where you do a Sunday 10K on your own... at a slow place... perhaps starting out around 70+ minutes... but speeding up by 1.5 to 2 mins per week.
On the other days, a 3 mile slow run and another day where you do a 4 mile run where you run at a steady pace but throw in a "fast mile" somewhere in the middle. Maybe extend the length of your "fast mile" by a quarter of a mile each week (so your 5th run would be 5 miles with 2 fast miles). Not that 'fast' might be 10 min per mile pace. Maybe have a swim or a bike ride on one of the other days.
Once you've got that next 4 or 5 weeks out of the way, have another recovery week and reassess where you're up to. Good luck.
Going from zero to 4 miles in 4 weeks is a really good achievement. I don't want to discourage you, but I suspect you're at quite an increased risk of injury at the moment though.
Your body needs to adapt to the new demands you're putting on it. Many people find that their heart and lungs adapt quite quickly... but their bones and tendons are slower to adapt. They accumulate damage quicker than your body repairs it, and after a few weeks, something gives. The prime time for a beginner to get shin splints, for example, is around 5-10 weeks if memory serves me right.
The way to avoid it is not to build up your mileage and frequency of running too quickly. Have a 'rest week' every 4 weeks or so. That doesn't mean you have to stop running all week, but perhaps halve your mileage this week... it just gives your body space to recover and redistribute cells, to be better adapted to the repetitive stresses of running,
You got good answers on the weight loss. 3600 calories per pound is the figure I have in my head. So that's about 10 runs to lose a pound... even if you don't get drawn into treating yourself. And that's a pound of fat... whilst you'll be laying down muscles that are denser than fat.