Hello,
To clarify
Speed Freak doesn't mean
Evil Sunz.
Evil Sunz is a klan kultur, Speed Freak is a unit keyword you can find on multiple orks fast attack slot units.
The Speed Freak keyword himself does nothing but it allows the unit to be target of some stratgem (like Billowing Exhaust Clouds) and bonus (like an exta +1" on move speed from the Evil Sunz kultur).
Another keyword you can see around is the
Kult of Speed, wich is another different keyword. For the cost of 1CP you can turn your detachment into Kult of Speed specialized detachment. It gives you access to additional stratagems, warlord trait ans relics that only few unit can use.
Returning to your army it seems OK for casual fun games,
just one thing, since codex Kommandos doesnt have anymore access to burnas. You are supposed to use the most recent publications of the rules and datasheets when they are available.
Edit: After few extra researchs it's quite ambiguous but it looks like you are "allowed" by the rules to use index wargears options for a codex unit if, I quote, «you want to use an old model with that wargear option»...