Nice work Shane. I can’t even begin to tell you how psyched I am to see that!
A picture is worth a thousand words and I’ve just been studying your photos. Considering where you are at in these photos - One way to think about approaching your next step of railing out is this: Your bottom has a harder edge (especially towards the tail right?), so why not consider making your base wider than your deck - saving at least the weight of 1/4 of your rail stock.
Somthing kinda like this:
This is just a quickie sketch so may not be exactly like yours but you get the idea.
What this would entail for you is taking your belt sander (make sure the belt is aligned right up to and maybe even a smidgen beyond the edge of the bottom plate), and hitting each frame vertically from the top. After you sand down about 3/8 of an inch let the sander fall/roll off to the outside. You’ll end up producing a rounded corner that mirrors the deck crown you’ve already got cut into your frames. All your really producing here is a place for the rail strips to land (and an extra point for glue). You could do them in steps too. But in any case, they don’t need to be perfect at this point because any inconsistencies will be absorbed by the final shaping.
For us, at GSb, this means we end up with 3/4" of base rail and 1 1/2" of deck rail
I found this photo that shows a little of what i mean about the sanding on a longboard.
Of course all of this means you have to adjust your deck’s outline to be a little smaller than your base, but that’s easy to do is you just make a little tool to help you draw the line (i’d be happy to show you how if it comes to it). As for fins, I’ve got key measurements for a 6’4 that might work for you, if you want them say the word.
Whatever you decide to don’t stress about it. The rails ALWAYS take a lot of time. You can be charging along great until you get to rails and then bogged down and frustrated. That’s totally normal, it’s happens to me all the time.
That board is f-ing awesome and you are going to be so stoked to ride that puppy.
We’re here for you if you need us!
ANYTIME
PS. You can do all of this even after you’ve installed your deck planks - in fact that’s when we normally do it.

