Occasionally, I have the opportunity to work with one or more fellow professionals in this field. The best advice I ever heard was to recognize that one of us is appointed Head Honcho, Alpha Male, Big Cheese... whatever.
The rest of us regardless of our opinions, experience or alter ego takes a back seat to the plan of action. It needs to be understood that only one of us will be responsible for the outcome of our coordinated/orchestrated efforts.
In other words, "Lead, Follow or get the ____ out of the way!"
Inform your well meaning husband that you have decided to take full responsibility upon yourself for the success or failure of this particular project and that you will inturn, refrain from impedeing upon his progress
whenever he chooses accept full responsibilty for a pet project of his choosing in or around the house.
Having said that, it is important that the "leader" aka project manager or DIY in your case, be open to suggestions, ideas, techniques along the way if you solicit feedback.
Frankly, it sounds like your husband needs to come to terms with his own interpretation of his role as a supportive team player or a backseat quarterback. Lay down the law that you too will also subject yourself to.