Prepare and toast the bread. Slice the baguette into thin 1/3-inch rounds and arrange them in a single layer on a baking sheet. Brush the top of each slice very lightly with olive oil. Place the pan under the broiler for 2 to 3 minutes, watching closely, until the slices are lightly golden and crisp. Remove from the oven and let cool slightly.
Spread the mayo. Spread a generous layer of mayonnaise onto the top of each toasted baguette slice.
Layer the tomatoes. Add 1 to 2 thin slices of tomato on top of the mayo on each piece of bread.
Add the cheese. Place a small square or triangle of Havarti or white cheddar cheese on top of the tomato on each slice.
Add the cucumber. Layer a few thin slices of cucumber on top of the cheese.
Add the ham. Fold or roll a piece of smoked ham and place it on top of the cucumber. Since the ham slices are large, cut them in half or into quarters first so they fit the sandwich nicely.
Add the salami. Fold or roll a slice of salami and place it on top of the ham.
Secure and serve. Push a toothpick straight down through the center of each sandwich to hold everything in place. Arrange on a platter or wooden board and serve immediately.