RE: Building a TOP FLITE ELDER
The Williams Bros accessories are sold by Sig Manufacturing. I bought the Parabellum machine gun (1/6 scale) WBR16300. It comes with an ammo belt. I chose the 1/6 scale pilot WBR17600. Keep in mind you'll need plastic glue and a selection of paint (I ordered Testors enamel from Tower Hobbies).
Just looking at the dimensions I was a little leery of the TopFlite wire wheel's 4" diameter however when placed on the fuselage they look fine. They are a little heavy but I doubt they'll be too heavy.
I'm mounting my Saito 56 with stock muffler.
I used the recommended Monokote color but it has been a little uncooperative while trying to place it on the wingtip. It has been a humbling experience (:-). If you go with the standard color scheme I found the Monokote self adhesive trim colors work well on the rudder.
I varied from the recommended construction in a few places but even though I meant to take pictures I always seemed to forget so I can't post picts. Sorry.
I would recommend using wet 1/16th sheets of skin on the nose. Two layers laminated with wood glue worked well and were easier to shape to the compound curves.
Don't add the gussets to the top rear fuselage where the stab is attached otherwise you will have to relieve the stab in order to fit flush to the fuselage.
As suggested by someone else, mount the engine so you have room to add soft balsa to the tip of the nose. This will allow you to create a rounded look. Not too rounded though or you may have trouble adding the chrome Monokote trim.
More than you asked for but you touched my gabby bug (:-).
Regards