is this the right box set up i need?

I am trying to plan how I am going to build a box to go in the ex cab of my toyota truck. I am putting 2 Fi Q15's in it with a AQ 2200 watt amp. The space I have to work with is 53'' wide 17'' depth and 22'' tall. I was told to use 1 layer of 3/4'' MDF then after the box is done add a 2nd layer of 3/4'' MDF to the outside of the box to help reinforce it, is this right? This is the first box I have build so I just wanna make sure I get it right. But this is what I have come up with so far, how does is this right, the subs call for about 4 cub feet each tuned to around 33.

Adding a second layer of 3/4" MDF would help but it is inefficient IMO. If you simply use 3/4" MDF and brace the inside of the enclosure you will have far better results and a much lighter enclosure. I typically use a double front baffle but I simply brace all of the panels. If you use good bracing techniques you will have a very well built enclosure that will not have material flexing. Eliminating flexing is the point of adding the second layer of MDF but it isn't the most effective. If you add bracing internally you will have better results, like I said previously. The only thing is you will need to increase the volume of the enclosure in order to account for the displacement the bracing takes up. Other then that the enclosure looks good.