Just my 2 cents.....
I think you will have problems trying to buck the logs when clamped inside the grapple, the pressure from the jaws will cause binding as the wood is cut and it shifts. The use of a spacer log to keep from hitting the back of the attachment is an invitation for kickback.
An open ended attachment isn't going to work well for loading firewood, you'll have pieces of firewood falling all over the place. A large skeleton (rock) bucket with sides added would probably be best here.
This is what I use for log handling:
Ed
Thanks. Grapple pressure causing binding hadn't been considered but should be. We're trying to avoid dumping the middle 72+ inches of logs into a cradle for bucking them up. Is there a way to back the grapple pressures off a little or are they usually either on as much as possible or off with no way to adjust?