Most suggest 1/2 size higher on tip-top. but if the one you have is a little too tight you often can gain a little room by sticking a bodkin or ice pick down its throat and working it around. If there are any burrs or local tight spots it most likely will get it to slide on . Do not sand the tip. I think Torzite is overkill. I've never grooved a SIC. While they are great tiptops, even the titanium SIC is pretty pricey. I use LG or the Arowana in SIC. but it's your rod.
Yes on the BIC lighter, but just use the edge of the flame near the blank as you rotate the blank. You don't want to get the epoxy really hot and you don't want any soot to form. Mix your epoxy, warmed a little by submerging the bottoms of the bottles in hot water in the sink until they feel warm, for 120 seconds, making sure to incorporate all the epoxy into the mix. Take it from the center as any not mixed well will be at the edge.
Size 4 guides will pass what you propose, even if you have to use an Alberto. If you use an Alberto finish it by really pulling it really tight and adding two half hitches of the braid tag end and pull them tight. I find this Alberto more reliable than the LG, but if you can do a reliable FG, it is the smallest knot.
Since most of the contact of the hand will be on the seat you don't need much of any fore or rear grips. I just use one inch custom turned ramps off the seat, then a butt knob on the butt end. I turn my own from cork rings. I think that seat "kit" you are using is designed to be up-locking with the nut covering the threads?? If yes, no front grip is necessary. A minimal rear grip can be used, mostly just for looks since there is not much hand contact there anyway.
Go to the Anglersresource.net for guide help. I use exactly what you are proposing for guide sizes, KLH 20-10-5.5M, two KB4's , then 4 KT4's on 7 foot rods. Many builders only use 3 KT's, but for a very fast tip I like an extra one. The titanium tiptop might make a slight difference in tip response time. Titanium runners will have a measurable effect on the true natural frequency of the rod (yes I've tested it) but not a major effect. I've made a lot of rods with stainless steel running guides and they work just fine. Using titanium reduction guides on this EXFast action blank probably will have no effect on frequency because the butt section is so stiff. The minor weight penalty probably will not be noticeable.
The site has a tutorial on a two line stress test. Use it. A two line test actually is easier than a one line test as the guides do not have to take the stress of loading the blank and they can be moved without unloading the rod. I place my first guide 19 inches from the tip of the reel spool shaft, use the calculated spacing of the three reduction guides found on the KR software on the site, then use the two line stress test to locate the runners. If you have trouble holding the tiny KT's while wrapping, come on back and ask for tips.
I put my keepers an inch or inch and a half in front of the front grip/reel seat on the bottom and have had no troubles with line snagging on them. Do not put it on top or at 90 degrees. I know those positons don't work well.
If you are using black thread it doesn't have to be NOCP. Regular nylon or polyester will work fine and will have a little more sheen than NOCP.
I don't think Fuji offers titanium alconite guides any more-you have to go SIC to get titanium. If I were you I would use stainless all the way.
I should point out that the KLH 20 is so high (that's why it works so well) that it won't fit in some round travel rod tubes. There is a good one that has a triangular section that I use that can hold two spin rods and two fly rods. It is by Temple Fork Outfitters and comes in two lengths.
You may have seen the photo before, but I include it to show how I do this rod and other similar spin rods.