Colocación de adoquines sobre un patio de concreto existente y extensión a una base de grava compactada

Tengo un área de aproximadamente 1000 pies cuadrados en la que quiero poner adoquines. Lo estoy haciendo yo mismo, así que quería presentar mi idea a otros solo para asegurarme de que estoy en el camino correcto. Aproximadamente la mitad del área (~500 pies cuadrados) es un patio de concreto existente.

• Área de Phoenix, AZ... poca lluvia y sin heladas
• Creo que romper el concreto es excesivo, especialmente sin un ciclo de congelación.
• I need to minimize height since the ground is already level with the concrete slab and I would prefer not to bring in tons of soil to regrade the lawn edge to be even with the pavers. There is also the issue of where this new patio will intercept the garage and I would prefer to minimize the step up. Because of this I was hoping to use thinner pavers.
• Pedestrian traffic only

This is what I was planning on doing:

• 4" compacted ABC on non-concrete area, final height will be level with concrete slab. Geotexture fabric under compacted ABC.
• On the edges where the sand could escape and underneath is the concrete slab, I was going to first mortar the paver down with ~1/2" of mortar to bring it up level with the pavers that will have sand under them. On the edges with the compacted ABC, I was going to put them on top of the screeded sand base and retain them with standard staked paver edging.
• 3/4" screeded concrete sand over entire concrete and compacted gravel base. After the pavers are compacted, I was hoping this would go down to ~1/2" so they are level with the mortared pavers.
• Thin pavers... maybe either something ~2" (http://www.belgard.com/products/pavers/lafitt_grana_slab) or 1.25" (http://www.belgard.com/products/pavers/cambridge_paver_tile).

¿Algún error flagrante obvio o malas ideas? Gracias por tu tiempo.