There are different mod settings for different playstyle.
Generally, the improved items will be the same size, with each tier specification a 2x value (4x on solar).
They dont require any extra to craft, for instance, a tier 2 item require 2 tier 1 to craft.

PHI-EN ENERGY

solar, steam, nuclear power.

PHI-MB MEGABASE

Entities with crafting speed. Furnace, assembling, refinery & chemical plant, centrifuge, lab, miner.

PHI-WE WEAPONARY

Entities that deal damage. laser, flame, gun.

PHI-EQ EQUIPMENT

Armor equipments. Better armors. fusion reactor, laser, roboport.

PHI-MI MEGABASE ITEM

miscellaneous changes such as landfill ingredient, effciency effect, void power robots.

PHI-SA SPACE AGE

[rocket] increased rocket cargo capacity by adjusting spaceship space or cargo weight
[heat] increased heat radius (ice planet)
[spoilage] disable most of the spoil (except the 2 ore).
[quality] quality module rate boost, default legendary quality (by setting normal)
[utility] no requirement on recipe and buildings (single planet run), easier space age tweaks, vanilla extend with space age content

PHI-CT CREATIVE TOOL

[tool] super radar, anywhere fluid pump, passive power void
[utility] trash chest, trash pipe, electric boiler, basic 1 slot chest
[hidden] loader, linked chest
[map gen] empty world generation