Access is from the front. You can swap an H-pipe and easily access the lower engine. For more space or for oil changes you can lift the rear to level out the stang. You can also now lift one side of the stang at a time up front (a tiny amount) easily with a floor jack for changing the front tires for example.
Is wood strong enough ?
Let just say laid flat the wood can lift your entire house (many tons) with no worry. The only worry we have (way back in our minds) is wood splitting, but if you pre-drilled your nails and / or glued your wood together, you should have absolutely no problems.
The "stepped" nature of the ramps
The stepped nature of the ramps also means that if for some reason you forgot to put a wheel stop behind your tires and you start jacking up the rear, your stang may only roll down one step, NOT roll down the entire ramp. Most other store ramps are single incline or 2 piece ramps, not stepped like these home made units :-)
Only 1.5" clearance needed
For most lowered stangs (or other cars) lifting is no problem, because we only need 1.5" in front of the tires. We have 18" of space before each step which covers the lower edges on many body kits. If you need more room, you can extend the step interval to 20+ inches. You can see there is plenty of room left before the ramps hit our rear tires.