Another jacking question

[Vista glass]

Joe

What you propose to do is possible, a lot of work but possible. I have done one corner for a quick fix when I was away from my garage. I did not want to leave it on a jack and fashioned what you are proposing out of materials that were there. It will be a trick to place your lumber pile while the jack is in position in the front. Getting under the rear support you should have plenty of access. Deserion's photo shows nicely the area to place your supports. You might want to do the rear first so you can slide those wheels below the vehicle as your safety while placing the support under the fronts. Certainly pad your temporary lumber supports with newspapers or something soft when you set the vehicle on them.
The jack provided with the vehicle is lightweight but adequate. You might as well freshen up your lug nuts too "While your are in there". Good luck and have fun. Take a picture.