If you want to use a car seat, I found the Isofix bases made them tricky to fit. I tried a couple of them and measured up quite a few in the shops. Main problem they all had was the bases were heavy and the leg got in the way. That square hole in my base was where I tried to make a location point for one of the bases where the leg would go through but it didn’t work well. If I just used the seat, either the angle was all wrong because it was for rear-facing in the car or the bottom was curved so it wouldn’t easily stay put. As much as it looked like it should work I couldn’t quite get it to do it in a way where it was convenient to get on and off.
It looks much easier with a front-facing seat with a flat bottom and some kind of tilt. I have a Joie Stages in the car which does this and it secures with the seatbelt. It sits at the correct angle on a level surface and would be ideal for strapping to a board or flat frame.
If you want to use a car seat, I found the Isofix bases made them tricky to fit. I tried a couple of them and measured up quite a few in the shops. Main problem they all had was the bases were heavy and the leg got in the way. That square hole in my base was where I tried to make a location point for one of the bases where the leg would go through but it didn’t work well. If I just used the seat, either the angle was all wrong because it was for rear-facing in the car or the bottom was curved so it wouldn’t easily stay put. As much as it looked like it should work I couldn’t quite get it to do it in a way where it was convenient to get on and off.
It looks much easier with a front-facing seat with a flat bottom and some kind of tilt. I have a Joie Stages in the car which does this and it secures with the seatbelt. It sits at the correct angle on a level surface and would be ideal for strapping to a board or flat frame.