Welcome to Bike Forums and Classic & Vintage. This is a great place to come and learn about your old Schwinn and to become addicted
to old bikes in general. Not only will we help you through the challenges and opportunities faced with riding a bike with a 5 speed freewheel and friction shifters, we'll encourage you to add to your fleet of C&V bikes. We can be really bad in this way!
It does look as if you have everything under control, except maybe, and this is just a suggestion--- the saddle!
We all have our favorites and we each realize a saddle is a personal choice. But my 2 cents would be--- install a Brooks B17.
I have one on my '87 Schwinn High Sierra. A honey or brown colored B17 would be the cat's pajamas!