Our team never used a holomonic drive train system and is it hard to code and does it slip a bit because all the wheels are omni wheels?
No, all you need is two buttons to strafe. My team uses l3 and r3 fot that.
As long as the H-wheel is always engaged with the ground, the drivetrain should not slip.
Makw sure that the H-wheel is in the center of mass not the center of the drivetrain otherwiae the robot will strafe at an angle.
Good luck building your H-drive!.
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Same. We have tank drive controls on the joysticks and then have programmed L-Up and R-Up buttons for the H-Drive control as those tend to be the most natural orientation for drivers (thumbs on joystick and index fingers on L & R buttons).
To @BananaPi’s point, we’ve had to slide our H-Wheels back and forth along the length of the bot a few times as its contraction has evolved and its center of mass changed.
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How is everything going, have you done it?
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So good so far. We built an H drive instead, but we aren’t into coding yet because our team is on vacation. We might have to take the middle wheel beause we do not have space for the Choo-Choo catapult. How is your team going on? 
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This is the biggest “con” about H-Drives. We went through 3 major rebuilds to fit it in (we used a ratcheting pully mechanism used in swish, we were able to use pulleys for a while to redirect the rope untill our last rebuild where we fixed this issue) I would reccomend you make a “mock H-drive”, just the frame" and try to fit the mechanisms (of frames of the mechanisms) into the drivetrain. Then, document your results in your engineering notebook!