depending on your talent and background, even 4 concept art images can be enough to raise hype (Dota2 is a prime example)
anyway just a quick heads up. with a kickstarter campaign where you raise 5k€ you’d probably be able to use 2.5k€ or less. a lot of money goes into paying kickstarter and the relevant taxes, and then pay for all the merchandise that you’d give back to your backers, etc.
and then you have the forced reality check on your kickstarter. why 5k? why not 2k or 10K? what does 5k really buy you? how many 3d models do you get with that money and how many do you need? how many sounds, GUI assets, and so on? a vast number of kickstarter projects fail because they run out of money