Just a few thoughts for modelling the F-15EX in 1/48. Use the lower port wing from a Mongram F-15A or F-15C kit as a drill guide for locating the outboard pylons since that kit has one on the port side carrying an ECM pod. For F110 exhaust nozzles, usa a F-15K (Block 1) conversion set.
In 1/72, hasegawa prodcued an early Strike Eagle kit that included the outbaord wing pylons and 1/72 F110 exhaust nozzles are readily available.