Little reason to make any connections in the wing root area. Leave enough wire to allow connections to be made under the seat pan.
The odds of ever needing to take off the wings = next to zero.
The odds of needing to troubleshoot after your initial testing = next to zero.
I used insulated spade connectors with a service loop just in case, but more than 11 years and counting, haven't had to touch anything. I could have used a continuous harness all the way to the panel.
Many use a terminal block, but I saw no reason to add another point or two for a loose connection. Looks cleaner though for the one time a year you pull your seat pans
To Bill's point, now is the time to think about where the fuselage holes need to go. If you have been sold on some kind of multiconductor connector, don't get me started.