Hi Lee,
Welcome to Permies!!!
First, when you have a chance, go to the top of the page and click on my profile and fill that out completely if you don't mind. We like knowing where folks are from, and a bit about them, as it helps with giving advice for general
permaculture issues.
I will reason that you have a plan for your logs all thought out, as cutting trees down without having a good plan for the timber is a fast way to end up with log that aren't good from much but mulch, and/or
hugelkultur.
I am not sure what you mean by an "a frame," as that is a for architecture, not a stacking method for logs? Do you have something in mind that I am not understanding?
You are good for cutting in winter, mainly because the bugs aren't as active in most areas, but you do need to get them off the ground into "bunks" or "cribs," at your "log landing" site that
should be in a good location for relocating the
wood onto trucks or for hewing/milling. What is often down for logs that will be milled or hewn is to cut a lesser quality log into 1 m (3') sections, notch just a little in the center and place these in a row about 2.4 m (8') apart. Then set a heaver log across these. You are going to make at least 3 of these and then place your other logs across them to get them off the ground.
Terms you should know, a tree dropped is a "log", a log cut into sections for milling is called a "bolt" (add about 150 mm (6") to 300 mm (12") for desire length of timber or board) and if you rough these out with ax or milling to have one or more flat sides they are called a "cant."
You need to get a proper lumber list together asap, and have the wood milled and "properly" stacked. If the logs go into warm weather the mold and bugs will get into them quick, which isn't that great and lowers the value/quality of the wood.
Regards,
j