I had to adjust the calculations from overthecap.com for the Giants' respective slots because they were not added correctly on the site on account of them not corresponding to the giants' actual selections. Jason Fitzgerald does a FANTASTIC job on that site nonetheless, and I HIGHLY RECOMMEND visiting his site to learn about how the cap works.
Here goes already with the estimated cap numbers for the Giants' 7 drafted rookies. The estimated total according to my figures below for all 7 picks is $4,643,388. The numbers below correspond to each individual player's draft slot: