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If i was to homebrew units by kit bashing 2 different armies like ork and tyrannid like orks looting a hive tyrant, do I simply add the cost of an ork and the hive tyrant? Do I get to combine the best stats over the worst stats of the two? Ork and sentinel?

Can I do things like put a squad of Slaanesh Marine on an Dark Eldar raider transport or put dark eldar warriors into drop pods? Or Orks looting a Ghost Ark because they both use a k instead of c?

Can I have cultists on eldar jet bikes by using the cost of a cultist and the cost of an (eldar rider-eldar guardian)?

If I combine a deamon prince with an Imperial knight, does it become a Traitor IK lancer? a 475pt model?

Can I put wings from a storm talon onto a dreadnaught a la Macross, can it have 3 modes of movement like flying zoom, hover, and walker? 230pts model?

If I modeled 2 rhinos together like a limo and rip the top hatch off, can i call it a Rhino Advancer and classify it as a transport of 20 men and open topped for 70pts?

These all are for home brew and I want to know what would be fair so that when I ask my opponent, he would not think its op and waac and not want to help me test it.

No, you have to compare the new stat line to other units and their effect on the game.

A Dark Eldar Transport is worth more to Space Marines than it is to Dark Eldar, since Space Marines would love a cheep Open Topped Transport.

You also can't just give Orks a Riptide, because then they wouldn't be lacking in long ranged shooting anymore.

Also keep in mind that several GW units, like Knights, are undercosted as is. Other units are bolstering a poorly written Codex filled with underpowered models, *cough* Hive Tyrants *Cough*.

You can't just cherry pick other units from the other Armies and slap a new paint job on them without even having to pay an Allies Tax.

The best homebrews are units that fill a much needed role in your army without subtracting from its flavor, or patching one of their intentional weaknesses.

Flying also is very powerful, units shouldn't just get to become Flyers.

Pretty sure Filch isn't being serious. I'm going to glue all my trukks together end to end with a greater daemon on the front so when I deploy and then pivot I will be in charge range.

yay.....

The point was ti understand model and unit cost better so i can succeed at convincing my friend to play with awesome home brewed armies with out it being too op.

My apologies then. There is an excellent post about vehicle design rules that has a downloadable instruction set. I suggest you start there, at least for vehicles.

It is probably easier within a codex than across codexes, but I have a little experience with My Hormagaunt/Gargoyle mix.

Back with the 5thed Dex, Gargoyles were the same as Termigants but plus 5pts (maybe?) for all the wings/venom stuff. I just added 5pts to Hormies for all the same benefits and made Gargoyles with scything talons. They lost the bounding leap things, but whatever.

Like i said, across codex stuff with probably be too messy, but it can be really easy to mix within a codex if you try and find out roughly what the differences are worth.

Well homebrewing in that sense is completely free of restrictions. Your essentially just making up units/rules or if you make a whole army your basically making a fan dex. There are no hard rules how to do this. It's basically down to whatever you and the people that would play against that feel comfortable with.

You could try to look for similar units first. the raider for marines isn't all that different from a forgeworld storm eagle. As far as I remember that's 20 slots and is also an assault vehicle. It's better armed and armoured though, but not a dedicated vehicle...I think. so shave a few points off of that and your pretty close I guess.

Of course that's not considering any options.