[HeavyToy]

I am not sure that all of the parts, though reinforced with glass, are of the same plastic. This issue with the instrument cowl is with respect to the ABS-PC and I beleive that the engine hood is a different plastic, but not sure just sitting here.

The joint tape would be perfect as the reinforcement but I do not beleive that the polyester resin will bond to the ABS or PC. If you notice that the engine hood of the tractor and the grill/light part are bonded together. The bonding material is probably the plastic weld compond that dqdave1 was told to use for repairs. Notice that this is done with a lap joint so the structure is carried primarily within the joint and not the bonding material.

If you perform all of the repair efforts from the inside of the part, you will keep the mess out of sight. However, it is inevitable that the paint finish will chip around the crack revealing the plastic color, and this will need to be addressed from the outside for a showroom look.

That said, some repairs such as the to the step area will not be sufficiently repaired from a structural standpoint. Once the part breaks, the cohesion of the glass to plastic is violated along the fracture and the structural integrety is compromised. The bonding of the plastic back together, even with reinforcment, will never have the same integrity as the original part and may require replacement or measures such as rivoting metal straps across the fracture or bonding a perforated metal plate to the underside.