Based on your axle thread it sounds like you will have a nice Jeep but overbuilt for the trails you are listing. That's no problem and it sounds like it will be cool cruising the streets and trails. Nothing wrong with the parts you are selecting but you aren't getting more flex than a traditional "mid-arm" JK suspension lift. It sounds like the coilovers are fairly nice without intrusion into the engine bay or rear tub but a properly placed 12" travel shock will get you the same flex. Because of the 40s or 42st that you are considering your realistic up travel will be compromised unless you do some major hacking so you may not get the advertised 5" of up travel; but, you'll have no problem with the droop part. If you only get 3" of up travel you have turned that 12" coilover into 10" of shock/coil travel. That will equate to more travel at the wheel since the mounts are inboard but that also applies to traditional shock and spring suspension too. 3-link, triangulated 4-link, standard arm, typical long arm, radius arm, they will all give you the same amount of flex on that 12" coilover kit. The suspension will feel different and the arc that the wheel travels will vary based on suspension but the links can't make a 12" coilover suspension flex more than the length of the coils. It also looks like the coilover kit gives you 5" of lift which isn't bad but isn't always needed for 40s but maybe for 42s. There are plenty of people on lower lift heights and 40s.
Most kit oriented 3-links make compromises in suspension geometry for packaging. That may not be terrible and it can be tuned out some with the proper shocks and springs. I'm not a suspension expert so I can't give advice on tuning. Overall any of the suspension link versions that still require a track bar start seeing issues after 12"+ of actual shock/spring travel. The TB pull the suspension to one side of the frame or other a lot more as the suspension articulates past ride height. It is common for high articulating track bar suspension to offset the axle from center at ride height to allow for clearance during the full range of suspension travel. It is possible for the axles to shift over 5" side-to-side because of the way the TB operates. Since you are staying with a safe amount of travel most of these issues are easy to overcome. Since you will be doing 1 tons you will have a raised TB in front which is good; I would make sure your rear axle track bar bracket offers 6" above factory location. Teraflex makes an excellent weld on bracket for bigger axles. Many of the standard brackets only offer 4-5" above stock. This is the best way to get that rear TB close to level.
If I was you, I wouldn't go with a kit coilover kit because you most likely won't be maximizing the travel of the kit unless you ask the manufacturer what flares, tires, and wheel offset they were testing with? That kit may have been designed around 37s which would use the full 12" while 40s or 42s may only use 10" based on the location of the upper mounts. If you have time and the space, I would order the axles, wheels, tires, fenders, then start figuring out desirable ride height and articulation. Once you get that figured out maybe it will be more clear what suspension type will work with the intended travel. My personal opinion would be that I would not want to use stock location low hanging axle mounts on $20,000 axles and tires. If I was going that far I wouldn't want to use a suspension that is designed and limited to the factory axle bracket locations. Just 1 point; a rear dana 44 with 37s and altered lower shock mounts offered by Metalcloak, Synergy and others will have better overall ground clearance than 60s or 14 bolt with that bolt on coil over kit. I don't like how low those rear coilovers hang but with 40s or 42s that may not be important to you based on the trails you listed.
It's your Jeep and have fun! Write down your ultimate goals and try to stick with them. Trying to buy all the parts at once sounds nice but more than likely there will be some parts that weren't designed for your tire size and goals and you may regret buying everything at once. You are in the territory where suspension kits, 1-tons, and 40s-42s don't mix well on the trail without proper planning. You are honestly in the custom build territory to maximize the benefits of 40s and 1-tons. Don't buy driveshafts until everything else is built and you can get actual measurements. You may be shifting axles forward and back to get them to sit properly in the wheel wells.