Look at this, the pattern isn't even available yet and I'm already suggesting how to modify it.
Please Note: These ideas are theoretical, which is to say un-tested as I have not knit through them.
I'm presenting them as a jumping off point for you. I hope you are either an experienced enough glove knitter to run with them, or can modify an existing glove pattern you own to incorporate them.
You want fingers on those mitts?
When I posted the first in-progress picture of the Trellis Mitts on the KFI Facebook page someone asked if they could be made as gloves instead of fingerless mitts.
That had not occurred to me because I don't knit gloves. Not only do I think the fingers are fiddly and annoying to knit, but my hands get so cold in glove weather that I need the wind break of leather or fabric.
But, of course the question got my wheels turning and I came up with two options. I'm presenting them now before the KAL starts on April 20 as you'll need time to think about and prepare for them.
Provisional Cast On
The mitts are knit from the fingers down to the cuff, which has the potential of making it tricky to add fingers.
My first idea is to start with a provisional cast on. Knit the mitts. Then go back and knit the fingers up.
Keep in mind that when you reverse directions you loose a stitch so you'll have to account for that in your stitch count. It shouldn't be too noticeable visually.
You'll probably want to move the thumb up.
As you can see in the picture, I have the cast on edge starting rather high up on the fingers. This works nicely for mitts but won't be so good for gloves.
It's a simple fix. After you've worked through the smocking directions try the mitt on and decide where you want the transition from hand to fingers to land. Then start your thumb gusset there instead of where I tell you in the pattern.
After you finish knitting the mitt, pick up the stitches from your provisional cast on and work fingers according to a glove pattern that fits your stitch count.
Keep an eye on your yarn consumption if you knit the cuffs much longer that I tell you in the pattern. You don't want to run out of yarn while working your fingers.
Top Down Fingers
A few years ago I stumbled across directions on the nonaKnits blog for knitting gloves by starting with i-cord fingers.
She instructs you how to knit each finger, join them, then knit the hand. This method might be easier since you are traveling in the same direction as the mitts. Also you'll be able to place your thumb more accurately since the fingers will hold it in place when you try it on.
The gauge and stitch count look about the same, which will make this an easy addition. I would say start the smocking either right after you join the fingers or work a few extra rows of ribbing after the join then start the smocking.
This option has to be addressed although I don't like it very much.
First, I don't like the way the Triple Leaf Pattern looks going the other direction. You can decide this for yourself either by tilting your head so my picture is upside down (haha) or knitting a swatch and twisting and turning it.
Second, this will require a lot more heavy lifting on your part. You'll be on your own for knitting the thumb gusset and placing the thumb hole.
Really, if you want to go cuff up, I'd suggest you find a glove pattern with a similar gauge and try to drop the lace pattern into it. Of course that leaves the fit a real wild card.
There is an event for the KAL on the Ella Rae Facebook page.
I started a discussion thread for once the KAL get's going.
If I need to, I'll start a discussion in the KFI group on Ravelry, too, but I'd rather try to contain questions to one location so they are easier for me to find and respond.