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Problem whit creating IH is that you have to use kits from multiple companys and not all uses the same size. There is a difference to hero model scale and non hero model scale as some companys says their model is, sadly moust of it is trial and error.

For your standard tacs GWs chapter upgrade works fine but i would advice you to NOT use the chest pices. they are very bulky and will mess whit your arms position.
Not mutch in that kit that can be used for devastator squads other then shoulder pad and heads.

Finding cyborg head sprues for space marines are nearly impossible, so i recommend to scout various gw bitshops online.

as for termi conversion that is a bit harder. clouses stuff i have found comes from here
https://hexy-shop.com/shop/sci-fi-miniatures/cyborg-x-92/
the parts scalewise fits a termi exept for the "bolter arm" it is way oversized, but you have to be good at modeling if you want to convert termis.
I am workin on a termi hq using the hq from forgeworld and the arms from above mention kit, but i see it is testing my knowlage of modeling.

As for dreds, if you skip the armor plating on the legs you have the visual setting right there.
You could allso use the open head chest option to place a bionic head there.