Forum adverts like this one are shown to any user who is not logged in. Join us by filling out a tiny 3 field form and you will get your own, free, dakka user account which gives a good range of benefits to you: No adverts like this in the forums anymore. Times and dates in your local timezone. Full tracking of what you have read so you can skip to your first unread post, easily see what has changed since you last logged in, and easily see what is new at a glance. Email notifications for threads you want to watch closely. Being a part of the oldest wargaming community on the net. If you are already a member then feel free to login now.

So I was thinking about how awesome Deffkoptas are and simultaneously how cool all-biker armies can be and I came up with a few simple rules to convert the basic Ork list into a list of mad flight-obsessed speed freaks (though of course there are downsides to doing this). I am aware that this could be done with just a special character, but I prefer allowing people to create their own awesome heroes so I decided to tweak the list instead.
HQ
A Flyboyz army may not take any named special character. Additionally, Wierdboy powers tent to mess with delicate rotors, so a Wierdboy cannot be taken in a Flyboyz Army.
Any Warboss or Big Mek may take a Kopta for +50pts. This confers an additional wound, changes their unit type to Jetbike, and adds a TL Big Shoota and 'Eavy Armour. They may select Kopta upgrades from the Deffkopta entry as normal. They may not take Mega Armour, because they would never get off the ground with it, nor a bike. They may not take a Bosspole either, because it would probably interfere with the rotors.
A Big Mek may still take a Shokk Attack gun (in this case, it is underslung, and the snotlings are carried in a special net or tank) but he must pay 90 points to do so. However, he may fire this even if he has moved - this will, however, incur a dangerous terrain test. He may not take a Kustom Force Field, because the lightweight frame of a Kopta is simply too fragile to carry such a powerful field generator. He may take any other options as normal.
A Warboss does not allow a Nobz or Meganobz mob to be taken as a Troops choice in a Flyboyz army.
Elites
Meganobz MUST take A Battlewagon as a dedicated transport in a Flyboyz army (see the Heavy Support section)
Nobz may be mounted on Koptas for 35 points each, gaining a wound, changing to Jetbikes and gaining TL Big Shootas and 'Eavy Armour. They may take Deffkopta upgrades as per the Deffkopta entry. They may not take Bosspoles or Waaagh Banners, but may otherwise take any options as normal. They may not select a dedicated transport.
Lootas, Kommandos and Burnas may select Warkoptas as Dedicated Transports (see IA:8).
Tankbustas may not be taken, as they have a tendency to practice on the the Mek's prized flying machines.
Troops
Boyz mobs may select Warkoptas as dedicated transports provided they are small enough to fit wholly within them.
Deffkoptas may be taken as Troops choices per the (modified) Fast Attack Entry
Fast Attack
Warkoptas may be taken as per IA:8
Deffkoptas come in mobs of 2-10 and can include a Nob, who has +1 S, A and I, for +10 points. He may select a Big Choppa or Power Klaw per the Warbiker entry.
Buggies may upgrade to Attak Choppas for +10pts (in which case they may not become wartrakks (but may still become Skorchas), becoming skimmers but otherwise remaining identical.
Heavy Support
Ork Aircraft may be taken as Heavy Support as well as fast Attack choices
Battlewagons must be upgraded with heavy-duty rotors or VTOL jets for +20pts, becoming Skimmers. They may not take Kilkannons but may take other options as normal. However, if they take a Ram or Deffrolla, they must take a dangerous terrain test every time they use it as they risk spectacularly crashing.
Deff Dreds, Killa Kans and Big Gunz may not be taken in a Flyboyz army.

Probably needs tweaking, fleshing out and reformatting, but what do you think? I tried not to make it too overpowered but I may have missed something...

It's VERY limiting on what you can take.

Honestly, just giving nobz, bosses etc the ability to take Deffkoptas (no mega armour though, for obvious reasons) would work fine enough. Or, add a SC that allows deffkoptas as troops and aircraft as HS as well. Then it's just mix and match your list.