Can you organize a picnic for him and your mom so that he could relax a little bit and take his mind off work for a while? Having a chance to do something else and think of something else is very important to people who work a lot. Think about his favorite meals, cook something or maybe get a delivery from the place he likes and plan a nice family dinner somewhere outside.
You say he has a projector which can also be used as a part of your gift if you make a video about him. You can do it on your on or cooperate with your mom or relatives or any friends of his and make a video about how loving, caring, hardworking and appreciated by all of you he is. Use pictures from family archives, maybe take several new ones (for example, ask people to take pics of themselves holding cute signs (something like 'We love you') and add them to the video), use songs he likes, etc. You can do the whole thing via online video maker or a slideshow app for pc and then just download it to memory card or dvd and play for your dad on his projector when you visit them.
Looks fun.
I can't see any videos on your demo site with this error..
Refused to display 'https://promo.com/shopify/embedded/5e25adddb0b20f00061e69eb' in a frame because it set 'X-Frame-Options' to 'sameorigin'.
Promo.com has come out with a new (FREE) Shopify app to help store owners easily create professional product videos by automatically pulling existing images from your product pages. Please let me know what you think if you give it a try. Here's the link if you're interested - https://apps.shopify.com/promo-com-promo-video-maker