The quest for the ideal wedding cake is one that requires a keen eye for detail, an understanding of aesthetics, and a palate refined enough to discern the subtleties of sugar, cream, and flour. The luxury wedding cake designer is akin to an artist, a Michelin-starred chef and an architect, all rolled into one. When you are on the lookout for that perfect cake for your nuptial celebrations, it is imperative to glean as much information as you can from your prospective cake designer, ensuring that your visions align.

Commencement of your journey in engaging a wedding cake designer should ideally be with a portfolio review. This becomes tantamount to understanding an artist's style, strengths and aesthetic leanings. The portfolio presents an amalgamation of the designer's past work, experiences, and experimentations. When analyzing these works, make sure to delve into the intricacies of design, the palette of colors used, the finesse with which the details are handled, and the complexity of structures achieved. Such an analysis will provide an indication of the designer’s capability to handle the design you’ve envisioned.

Once you’ve appreciated the artistic breadth of your potential designer, it's time to probe the culinary depth. The wedding cake, without doubt, is a visual spectacle. However, it's also a culinary delight and hence, understanding the flavors, techniques, and ingredients used by your designer becomes imperative. Ask your designer about their favorite flavor profiles, their expertise in handling exotic ingredients, or their ability to cater to specific dietary requirements if needed. This exploration will help you understand if the designer can match your gastronomic expectations.

Another critical aspect to discuss is the sourcing of ingredients. The luxury in a wedding cake is not just limited to its aesthetic appeal, but also lies in the quality of ingredients used. A designer who sources locally grown, organic, and high-quality ingredients is likely to deliver a cake that is not just visually stunning, but equally delightful to the taste buds.

Having covered aspects of design and taste, it's time to delve into logistics. The creation of a wedding cake is a delicate process that requires time and precision. Discuss the timeline of cake creation, starting from conceptualization to the final delivery. This will help you align your wedding preparations with the cake's readiness, minimizing any last-minute hiccups. Discuss the location of cake assembly, whether it will be done in the designer's kitchen, or at the wedding venue. Also, ascertain the transportation details to avoid any mishaps.

The final piece of the cake-selection puzzle lies in understanding the cost breakdown. Luxury wedding cakes are often bespoke and hence, priced accordingly. It's important to understand what you are paying for. Ask your designer to provide a detailed cost breakdown, including design consultation fees, ingredient costs, labor charges, and any additional costs like delivery or setup. This will not only help you understand the value you are getting but also enable you to compare proposals from different designers.

Your conversation with your cake designer is much like a dance, a waltz of words where you and the designer are partners, moving in harmony towards the creation of a masterpiece. Do not shy away from asking questions, even if they seem pedantic. It's your big day, and your cake is a centerpiece, a testament to your love, and a work of art that deserves nothing but perfection.

In conclusion, approaching a luxury wedding cake designer needs a blend of appreciation for the art, understanding of the culinary aspects, insight into logistics, and a keen sense of cost-value analysis. The relationship that you build with your designer will be instrumental in creating a cake that is a feast for the eyes, a delight for the palate, and a memory to cherish for a lifetime.