I've figured it out. You need to use Unity Explorer.
First install MelonLoader v0.5.7, then extract UnityExplorer.MelonLoader.IL2CPP directly into IntiMate game folder
When you load up the game, you should see Object Explorer. Select Object Search and type UnityEngine.UI.Slider into Class filter and hit searchs. This will bring up all the options changeable using a slider.
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Double click the value you want to change to open up the inspector window. Then you can adjust the Slider.minValue and Slider.maxValue. You can then adjust Slider.value to whatever value you want.
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That said, I have hit somewhat of a roadblock for most of the values. I have only successfully changed the value for weight. The other values seem to not do anything even if you changed the Slider.minValue, Slider.maxValue and Slider.value values.
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Would really appreciate input from any experts on this.
Also worth mentioning that MelonLoader is a universal unity mod loader so if anyone has experience modding unity games you may be able to figure out how to load custom models into the game.