I'm currently covering my MW Extra. It was a really straightforward build. I tossed the MW tailwheel and installed a Sullivan, very light and very strong. I went the glow route because from my experience with Extra's I prefer the way they fly when they are lighter, but if you are really looking to have ulimited vertical and be able to perform 3D stuff then the BME 50 is a great choice. I am going to use the Hangar 9 turnbuckles for hardware but Rocket City is good also.

Don't waste your money on the ABS cowl and pants that are available from MW, I've seen them and they aren't pretty after 20 flights. There are many glass cowls available for this plane, I used Aeroglass.