No harm meant but you did ask for advice.
Having already pulled one from the proverbial grave I know what is involved to modernize one and the cost is still climbing.
It is a sobering action to put a price to everything excluding your own labor and then try to justify it to someone or even yourself, not that you have to.
The main issues are time and money. Without both it is doubtful the project will be completed and you will lose both investments. I would not want that to happen to anyone. If either are a concern then go back stock as the upgrading will eat up the resources.
