Used heat to facilitate removal of the main-gear mounting plate; if it is actually hot-melt glue, it only becomes gummy under the heat gun but will let go under significant leverage.
Ran bolts thru fender washers to spread out the load on the gear plate and clamped on Vice-grip pliers to give a handle to pry on - prying it out lifted the adjacent bottom sheeting.
Partially installed landing gear screws and some spacers under plate allow quick removal of the blind nuts using light tapping.
Removed forward bottom sheeting and used additional heat with chisel to remove gear doublers from fuselage sides; there is no fuel proofing in this area so will now have better access to do so.