Yeah, the idea is to use an off-the-shelf portable aluminium ramp for the drop from the new level step to the path, and for the indoor step between the rooms.
Ramps for PVC door frames seem to be tricky, as you can't easily one-size-fits-all them. Once I started building it I realised that the inside and outside levels are different, that there's a slope on the concrete door step, and that nothing's quite straight. Cue trigonometry and cutting at weird angles with a circular saw.
Still to come is the ~50mm drop between the path and the pavement. My plan is to prise up the row of wonky bricks (visible behind barakta in the photo) and molish a small concrete ramp in their place. Hence the bag of ballast.
Bit of a faff for bikes, and annoyingly[1] barakta's trike doesn't fit a standard doorway, so has to be rotated sideways and carried. Same problem with the larger Carry Freedom Y-frame trailer, actually (the smaller one is specifically designed to roll through doors), but that's an easier single-person lift.
[1] ICE used to make a model that did - the now legendary QNT - but they discontinued it on the grounds that people cared more about cornering stability than fitting through doorways.