Congrats on attempting to build your own rod.
On the reel seat, I'd call someone like Mark at
C&M Custom Tackle Rod Building Supplies who is an ALPS dealer and ask him which size fits your Tib. Typically, you'd want the reel seat to have the smallest ID that fits both your reel and rod. However, if it's significantly larger it shouldn't be a problem if you use the appropriate arbors and epoxy.
I've never used ALPS guides. The standard jigging/popping guide is the Fuji MNSG or ICMNSG (color being the only difference). You want your tip to be the same size as your smallest running guide. You'll also need to learn how to perform a static deflection test to properly locate the guides.
A gimbal is just like a reel seat, it'll have arbors no matter what, so the ID is not critical, use an aluminum one.
For thread I normally go A-A-A or A-A-D
I don't know how you plan to jig with this rod, but a 10" rear grip seems awfully short to me. 12"-14" is closer to normal on a jigging rod.
There's nothing particularly difficult about an acid wrapped rod as long as you have the right information on how to do it (and there are many approaches).
Doc's vids are killer, I'd advise anyone new to building heavy rods buy a copy.