I modified this mod for my own use. I added a heat penalty to each apparel, helmet (-4), jacket (-5), pants (-4).i always play desert biome so I didn't want to succumb to heatstroke so fast. I think it would be good if the full suit gave u constricting clothing debuff if worn for more than half a day, also it could potentially give an offset to comfort while worn. I prefer the constricting clothing trait idea more though.
I will also be adding synthread or such to its recipe. I would suggest making a mark I and Mark 2 variants with improved heat insulation and improved protection by adding plasteel and synthread.
For the anti toxins I suggest u keep it simple with the 3 variants of varying degrees, so u need more treatments for the lowest one and only 1 treatment for the glitter world variant. The mid one wud need possibly 2 treatments to clear toxin.
For prevention u can also do similar where it protects for x amount of time y% of toxins. Just some ideas, hope it helps.
Edit thanks for a great mod