I think which item is a "MUST DO MOD" is really up to the pilot. Some pilots go further than others on mods. I made several and most seem to do fine with exception to a few. I took photos of the complete build of my FT 90. If you need any photos just e-mail me with what you need.

I had a Sullivan tail wheel (5-10lbs), but it kept twisting and buckling even on good landings which would limit the amount of time I could fly, so I replaced it now with another type that seems much better. I flew yesterday doing flat spins (upright and inverted), blenders, knife edges, walls, waterfalls, harriers, hovering, torque rolls, rolling circles, rolls, etc... This plane is very fun. If you are at sea level, the YS 1.10FZ is all that is needed. Vertical performance is very good. The APC 16x4 is spinning constantly at 10,300 on the ground. I need a APC 16x6 or 17x4 to get the rpm down some. I can't imagine what 30% would fly like.

Specs with conclusion to the side
YS 1.10FZ (WOW!!)
Wildcat 20/20
(5) HS-5645MG on control surfaces (168oz torque Digital Servos)
(1) HS-85BB on throttle (49oz torque analogue servo)
Robart hinges,(5)3/16" for Ailerons & (4)1/8" on each elevator and rudder (smooth movement)
Gorilla Glue used for Robart Hinge installation
Robart 1" Control Horns
1" servo arms
Hitec Super Slim 8-channel Rx
Futaba 9C Tx
1650mAh NiMH 6.0V (4.9oz weight)
Dual Wire Tail Brace (Stiffer tail)
Great Plane Scale Tail Wheel assembly (much better)
20oz Tank (22 minute flights)
APC 16x4 prop (spools up quick, but I need a APC 16x6 or 17x4)
2.5" Tru-Turn Spinner (perfect size)
PSP Spinner adapter kit (1/2 price of Tru-Turns and works great)
PSP Fuel Dots (easily refuels and depressurize the system)
Beefed up entire wing (highly recommended!!!)
Charging jack
Black Nylon wing bolts
Clipped in wing (extra insurance if the wing bolt breaks)
Blocked wheel pants (didn't make a difference because they still cracked, no longer used)
No pilot to save weight (Could have used one, but did'nt)
1:1 Mechanical Advantage on servos (very important to reduce flutter)
All gaps are sealed including the rudder
RTF weight 8.67lbs

Couple of photos to show mods

Sullivan bent wheel (the 10-22lbs version may do better)


Great Plane Tail wheel being used now


PSP Spinner Adapter Kit


Clipped in wing


Hope this helps and again if you or anyone needs any photos, feel free to e-mail me...

DTB