So the whole point of this build is to have better self-healing than a rogue typically has. It's in the title, after all.
Obviously, anyone can use Cure potions. A pure rogue can also invest in Use Magic Device (UMD) which allows them to use wands and scrolls. But it takes a while until your UMD is high enough to be useful, particularly for newbies who don't have all the UMD-boosting gear etc. which a veteran player does. What if that's not enough to keep you alive?
So this build is halfling to take the Dragonmark of Healing and splashes cleric to unlock Heal skill and metamagics, with the fringe benefit of being able to use divine wands too. Not just for Cures but also Resist Energy and any other useful buffs.
The downside to this approach is the AP and feat cost incurred by the Dragonmarks. Pure rogue Mechanic is feat-starved and even a F2P Mechanic wants to spend something like 44 Mechanic / 23 Assassin / 3 Acrobat, which doesn't leave a lot of wiggle room.
If you drop the splashes and the Dragonmark, then you're just another pure Mechanic and those builds are pretty well-documented in other threads (e.g. this one).