Extensions to the standard model of particle physics are vast and numerous. Particular attention has been given to models incorporating large extra dimensions, building on the idea of the Randall-Sundrum warped metric. I will focus on a variant of the second Randall-Sundrum model, where the extra dimension is infinite in size (in contrast to the compact model) and the so called "brane" is generated by a bulk scalar field. This model is motivated by the desire to have the action symmetric in all spatial dimensions, with three-dimensionality arising from the spontaneous formation of a domain-wall. I will show how such a domain-wall forms, how scalar fields and massless chiral fermions can be confined to the domain-wall region, and how gauge fields can be incorporated using the Dvali-Shifman mechanism. I will use these building blocks to write down an SU(5) grand unified standard model in 4+1-dimensions. Features of this model will be discussed, along with extensions to larger gauge groups.