I don't think you are grasping the concept here. You don't borrow your down payment (that would count against you when applying for a loan). What you borrow is the cost of your home, minus the amount of your down payment. Then you add in earnest money (the amount you come up with to show the sellers that your offer is serious...usually $1000 or so), and closing costs. Honestly, you'll probably need to have $2500-$3000 minimum in cash before you all even start thinking about a house.
I like both of you guys, and think you're decent folk...but you're living pipe dream right now. I can't honestly fathom how you are even thinking about some type of honeymoon (I think 3D mentioned Germany?), even if it's in the distant future. It's obvious you guys are strapped for cash, there's no way in hell you'll be able to afford that type of trip in less than 1 years time. And honestly, unless you get some type of miracle influx of cash, the home is somewhat of a pipe dream too.
1rst things first...GTFO of 3D's parents house, and rent an apt/house (ya, I know having pets can make it a bitch, but you'll find a place if you look hard enough).
Secondly, pay off the fucking debt...it will haunt you.
Third: Once debt is paid, then save for a home (ernest money, closing costs)
4th: Buy home, furnish it...and then, and only then...save for a honeymoon.
The positive in all this, is that a lot of lenders may let you use the Government tax credit as your down payment (you've missed the deadline for the $8000, but are still eligible for the $6500. Take advantage of this BEFORE IT GOES AWAY.
Words of wisdom from da'kid.