Like you, I'm an experienced woodworker who took up playing a ukulele late in life. I chose to build a high quality kit ( Stu-mac mahogany tenor) and customize it as I built. I changed the top to spruce, added a custom rosette, and maple bindings. Over all, the experience was positive. But be prepared to learn a lot during the experience. Such as:
No matter how many tools you have collected over the years, you don't have enough and they aren't the ones you need.
You need to learn to be more precise at every step in the process and patience, patience, patience.
You need to look ahead at virtually every step in the process.
You will make mistakes, that's part of the learning experience. Fix them as best you can and go on.
You will have spent a great deal of time and money for your efforts. Far more than you would spend on a good instrument from a quality builder.
In the end you will gain two valuable things, a great deal of pride in what you have learned and accomplished and the utmost respect for the artistry and skills of the many great luthier's out there.
Go for it. Enjoy it and good luck.