We do something similar. Two days. All players do IF, OF, hit and timed runs.
IF grounders, all taken at SS except obvious 1B types. Each player gets a few straight at them, a few to each side and a do-or-die. OF fielding and throws from RF. Each player gets a few to each side and a few on the ground with throws to 3b. Hitters get an on-field session that includes bunting, hitting oppo and free swings. Running - each player gets two timed 60's and two home-to-first's. Ratings are done cumulatively by most of the V and JV coaches on a 1-5 scale. Categories are as follows...
Infield - Footwork, Range, Fielding mechanics, Throwing mechanics, Arm Strength and Accuracy
Outfield - Footwork, Range, Mechanics, Arm Strength and Accuracy
Hitting - Bunting, Oppo, Quality contact, Power and Swing mechanics.
I calculate and average all ratings. Afterwards, coaches all meet and discuss the numbers as well as attitude, intangibles, gamers, etc. When cuts and squad designations are made, it is definitely a group effort with feedback from all coaches.
After having built up to this over the last few years, I feel like we've hit overkill and will likely condense going forward. There are rarely surprises where the numbers say something different than the naked eye tells us.