Inner planets Suggestion

KSP has only two planets as the inner planets, so I decided a solar system with three inner planets.
Venus Analog
Just like Venus, nothing special except it's more geothermaly active and has poisonous oceans.
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Mercury analog
Numerous large craters and Sink holes on the surface
Has line like features known as Scars
Also more geothermaly active
Mares dues to the sun's heat
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Hel, a planet just to challenge players
A planet near the Roche limit of the sun
Is tidally lock
On one side, the planet's surface is filled with a lava ocean with numerous islands ( largest being the obsidian crater)
At the back is a frozen plain with Scars and geysers.
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This will be the most challenging of all planets in the current solar system.