You're most welcome for the info.
Yes, to clarify, holding in a covered pan meaning to hold the food at temp, placed in the oven or smoker. Although most electric ovens won't go below 170*, not sure, but gas probably won't, either. A roaster oven would likely work, also, as long as the thermostat will allow you to set to the desired temp. In any case for holding at temp, I like to have a temp probe in the meat to verify, especially when holding for a few hours, so I know it's safe. It's all about the danger-zone temps of 40-140*.
What makes holding at temp for extended periods a bit tricky is if you can't get the temp right...too hot and the food will continue cooking, too cool and it's not safe to eat if the time is too long. For shorter holding, if 150* is the most stable temp you can get, it doesn't really hurt, but if for 4-6 hours, then your ham will continue cooking, as an example.
The butt portion ham is a bit bulkier than the picnic, so it may take a bit longer to heat through than the 1.25hr/lb. Maple for the start of the ham? Yeah, baby!
Anyway, starting the pieces a bit earlier than you expect them to take is you best course of action, then hold at temp if needed. The ham going in first of course, then the larger loin, and the smallest being last. Also, keep in mind with opening the smoke chamber door to add another piece of meat or to tend smoke wood, water pan, etc, the overall time for the pieces already in the smoker will be increased due to heat loss from the smoker and getting back to stable temps again. Judging all of this is pretty difficult at best, but starting early gives you some insurance for being ready on time. It adds some challenge to the equation when cooking to temp, and temps are your best indicator of the safest and highest quality product. Highly experienced cooks may be able to get an individual piece of meat cooked on time, every time, on nearly a daily basis, because they do it quite often and know their cut and weight of meat and their cooker very well...they're working in a much more controlled environment than we do. For the backyard cook, we work with irregular weights and cuts of meat, the environment in which we cook is constantly changing (weather), so the variables we work with are almost never the same. Even a professional cook would find these conditions difficult to overcome, until they've gained some practical experience.
Most folks aren't accustomed to cooking to temp, going by time only, based on a recipe for cooking in an oven (for example), and even different ovens cook at varying rates, just as smokers will. Internal temp of the meat is the only reliable way to go. Now, if everyone could to get the timing down for their cooker, knowing how all the variables will effect the outcome...that's the real challenge.
I digressed...food for thought.
Yes, do keep us up to date...I'll keep my eyes peeled for pics!
Eric